Make du’a for them along with what you are doing. You have done your obligation and the sin is on them.

I recently suggested 2 my cousin that her profile pic on WhatsApp was a bit too attractive. I’ve been dropping hints on improving on religion also for some time now. She blocked me in response. Similarly, when I advised my sis-in-law not to go in for the birth control operation, she said she knows it’s haraam but she did it. How best to deal with such relatives who knowingly sin?