I know we all have family members like this. My Dad is the same way and even has dementia. My daughters are in the same boat I was in during my teens and early 20's. We cannot project our life experiences onto them. They need their own encounters with the risen Lord. Even with our family on FR we can discern those who believe in Christ and those who only know of him.
I can only leave it in his hands.
This is the answer, GOD IS GRACIOUS! Let's say we worry about their destiny, Is this what Jesus tells us to do?
In my experience when I try to talk people into faith it sometimes causes problems if I need them to agree with me. With my kids God provides golden moments to say something if His Spirit wants me to speak.
Might I suggest a book by Mike Gendron, “Preparing Catholics for Eternity” http://www.pro-gospel.org/