Survey responses of percentage of participants who report reading most or all texts thoroughly. The 6 month survey asks participants to what extent they have read the text messages. There are 3 response options: 'I read through the text messages thoroughly most times' in the follow-up survey as opposed to 'I took only a short look at the text messages most times', or 'I did not read the text messages most times'. The current outcome indicates the number of participants who responded 'I read through the text messages thoroughly most times' among all participants that completed the 6 month survey.

Metrics of the percentage of messages sent by participants to interact with the intervention that were keywords. Participants were able to send text messages to receive tailored text messages back about topics to cover their needs. Text messages they could send include chat messages with a live coach (e.g., like any text message people send ordinarily) or keyword-driven messages (a specific keyword that triggers an automatic message). The research team counted the number of messages in the software report that were keywords and chat messages and calculated the percentage of those that were keywords and later calculated the average of that percentage for all participants.

Research team-developed one item with a 4-item Likert scale on satisfaction with intervention, higher scores meaning higher satisfaction. In the 6 month survey, participants were asked what their levels of satisfaction are regarding the intervention as a whole. Options ranged from Not at All (1) to Extremely (4).

Interpersonal Support Evaluation List-12 (ISEL-12): 12-item instrument that that yields a total score that describes overall perceived social support, and three subscales representing perceived availability of appraisal (advice or guidance), belonging (empathy, acceptance, concern), and tangible (help or assistance, such as material or financial aid) social support. Each item is rated either definitely false (1), probably false (2), probably true (3), or definitely true (4). Scores are summed for the total scale (12-48) and subscales (4-16). Higher scores mean higher social support for each scale. The current outcome is the scales' score at month 6 minus the score at baseline.

Preparedness for caregiving scale: The Preparedness for Caregiving Scale is a caregiver self-rated instrument that consists of eight items that asks caregivers how well prepared they believe they are for multiple domains of caregiving. Preparedness is defined as perceived readiness for multiple domains of the caregiving role such as providing physical care, providing emotional support, setting up in-home support services, and dealing with the stress of caregiving. Responses are rated on a 5 point scale with scores ranging from 0 (not at all prepared) to 4 (very well prepared). The total score is the sum of all items divided by the number of items (eight), and ranges from 0 to 4. The higher the score the more prepared the caregiver feels for caregiving. An example of an item is: "How well prepared do you think you are to take care of your family member's physical needs?". The current outcome is the scales' score at month 6 minus the score at baseline.

10-item Center for Epidemiologic Studies-Depression scale (CES-D-10): This is a 10-item, self-report rating scale that measures characteristic symptoms of depression in the past week (e.g. depression, loneliness, restless sleep). Each item is rated on a 4-point scale, from 0 (rarely or none of the time) to 3 (most or all of the time) with positively worded items (items 5 and 8) reverse scored. Items yield summary scores that range from 0 to 30, with higher scores indicating higher severity. An example of an item is: "I was bothered by things that usually don't bother me". The current outcome is the scales' score at month 6 minus the score at baseline.

Metrics of percentage of participants who texted STOP keyword. Participants are instructed during the course of the intervention to send the keyword STOP if they want to quit the intervention. The research team counts each participant who sends the keyword STOP, as seen on the software report, and calculates a percentage among all the participants.

Survey open-ended reports of technical problems. A question in the 6 month survey asks whether participants experienced any technical problems with CuidaTXT during the study. The response options are Yes or No. The outcome is the number of participants who responded Yes to this question among all the participants who completed the 6 month survey.

Metrics on percentage of participants who sent at least one text message. The CuiaTXT intervention consists of participants receiving and sending messages to the program. The research team has access to the CuidaTXT software, where they can see the messages each participant has sent to the program. This metric is the number of participants who sent at least one text message to CuidaTXT among all the participants.

Survey responses of percentage of participants who report reading most or all texts thoroughly. The 6 month survey asks participants to what extent they have read the text messages. There are 3 response options: 'I read through the text messages thoroughly most times' in the follow-up survey as opposed to 'I took only a short look at the text messages most times', or 'I did not read the text messages most times'. The current outcome indicates the number of participants who responded 'I read through the text messages thoroughly most times' among all participants that completed the 6 month survey.

Metrics of the percentage of messages sent by participants to interact with the intervention that were keywords. Participants were able to send text messages to receive tailored text messages back about topics to cover their needs. Text messages they could send include chat messages with a live coach (e.g., like any text message people send ordinarily) or keyword-driven messages (a specific keyword that triggers an automatic message). The research team counted the number of messages in the software report that were keywords and chat messages and calculated the percentage of those that were keywords and later calculated the average of that percentage for all participants.

Research team-developed one item with a 4-item Likert scale on satisfaction with intervention, higher scores meaning higher satisfaction. In the 6 month survey, participants were asked what their levels of satisfaction are regarding the intervention as a whole. Options ranged from Not at All (1) to Extremely (4).

Average satisfaction score in a 1-item scale that ranges from Not at All (1) to Extremely (4) satisfied.

Epidemiology/Etiology Disease Scale: 14-item, true/false scale takes approximately 5-10 min to complete. An example of an item is "There is no cure for Alzheimer's". Each correct answer is scored as 1 point and each incorrect answer as 0 points. Points are summed up for a total score, which ranges from 0 to 14. Higher scores mean more questions answered correctly. The current outcome is the scales' score at month 6 minus the score at baseline.

Interpersonal Support Evaluation List-12 (ISEL-12): 12-item instrument that that yields a total score that describes overall perceived social support, and three subscales representing perceived availability of appraisal (advice or guidance), belonging (empathy, acceptance, concern), and tangible (help or assistance, such as material or financial aid) social support. Each item is rated either definitely false (1), probably false (2), probably true (3), or definitely true (4). Scores are summed for the total scale (12-48) and subscales (4-16). Higher scores mean higher social support for each scale. The current outcome is the scales' score at month 6 minus the score at baseline.

Preparedness for caregiving scale: The Preparedness for Caregiving Scale is a caregiver self-rated instrument that consists of eight items that asks caregivers how well prepared they believe they are for multiple domains of caregiving. Preparedness is defined as perceived readiness for multiple domains of the caregiving role such as providing physical care, providing emotional support, setting up in-home support services, and dealing with the stress of caregiving. Responses are rated on a 5 point scale with scores ranging from 0 (not at all prepared) to 4 (very well prepared). The total score is the sum of all items divided by the number of items (eight), and ranges from 0 to 4. The higher the score the more prepared the caregiver feels for caregiving. An example of an item is: "How well prepared do you think you are to take care of your family member's physical needs?". The current outcome is the scales' score at month 6 minus the score at baseline.

10-item Center for Epidemiologic Studies-Depression scale (CES-D-10): This is a 10-item, self-report rating scale that measures characteristic symptoms of depression in the past week (e.g. depression, loneliness, restless sleep). Each item is rated on a 4-point scale, from 0 (rarely or none of the time) to 3 (most or all of the time) with positively worded items (items 5 and 8) reverse scored. Items yield summary scores that range from 0 to 30, with higher scores indicating higher severity. An example of an item is: "I was bothered by things that usually don't bother me". The current outcome is the scales' score at month 6 minus the score at baseline.