The goal of this clinical trial is to learn the long-term effects of "Family Walking Instruction with Support by Heart" (Family WISH) on frailty state, quality of life and family functioning among adolescents with congenital heart disease (CHD).

Researchers will compare the 12-week Family WISH program, based on self-efficacy theory, to a comparison group receiving a family walking health education sheet to evaluate the long-term effectiveness of the Family WISH program.

Participants will:

• Walk with family members for 20-30 minutes daily, at least 5 times per week, totaling 150 minutes per week.
• Keep a diary to record the frequency of their walks and any symptoms experienced.
• Complete questionnaires at baseline, and at 6, 12, and 24 weeks.

Inclusion Criteria:

• being between 12 and 18 years old;
• having received a diagnosis of CHD by a physician before age 2;
• having received a diagnosis of CHD with New York Heart Association (NYHA) functional class I, II, or III;
• having parents or guardians who were able to communicate in Mandarin, and being able to communicate in Mandarin themselves;
• not having cognitive impairments, and;
• voluntarily signing informed consent forms.

Exclusion Criteria:

• undergoing heart transplant surgery within the past year;
• receiving cardiac catheterization intervention or open-heart surgery within the past 6 months;
• having CHD with NYHA functional class IV; and
• having other congenital diseases

To ensure assessor blinding, different personnel conducted the interventions and outcome assessments.