Participants in this group (all participants) are asked to complete a questionnaire and then receive access to the website during three days, after which they were asked to complete another questionnaire.

The tool is a website aimed siblings and children of someone who has suicidal thoughts and/or behaviors. The intended objectives of the tool are 1) to contribute to knowledge about suicide and health care options, 2) to increase perceived competences in dealing with suicidality of a family member, 3) to reduce perceived pressure and negative feelings such as hopelessness and 4) to be accessible and user-friendly.

These objectives are achieved by providing the following content: 1) concerning the sibling/child themselves (primary objective) : information about the potential impact of having a suicidal family member, own needs, informal and formal (self) care, dealing with the suicidal family member, dealing with other family members 2) concerning the suicidal family member (Secondary objective): information about the suicidal process, signal recognition, how to provide support/create a safe environment for suicidal loved ones , help available for suicidal relatives

The Gatekeeper Self-Efficacy Scale is a 9-item self-report scale to be scored on a 7-point Likert scale (1= not at all to 5 = Extremely) to measure participants' self efficacy in dealing with suicidal individuals. Higher scores indicate higher self-efficacy.

The Perceived pressure informal care ('Ervaren druk informele zorg', Pot et al., 1995) scale is a 9-item self-report scale. Participants rate items to be applicable to them with the options: 'No!', 'No', 'More or less', 'Yes', 'Yes!', where 'No' and 'No!' are scored as 0 and the other options as 1. Total scores of 0-3 indicate little pressure, 4-6 moderate and 7-9 a lot.

age (continuous), gender (man, woman, other), previous health care (yes/no; categories 'professional healthcare provider', 'suicide prevention helpline', 'other'), needed health care (yes/no)