I can relate to the feeling that there’s something wrong with you enjoying your own life while a family member is suffering. One that that helped me was remembering that my life and their suffering were completely independent. They didn’t suffer more if things were going well for me, and they wouldn’t suffer less if I were miserable too. My happiness/peace/bright future was not something I was achieving at their expense, it was all my own. Totally separate. This is a variant on not taking unwarranted responsibility for someone else’s life.