Prayer for Salvation & Healing

We found out my 8 year old niece has cancer about a month ago. Her parents are not saved and the home environment is really not well. If you can please pray for my sister, they are not married and he doesn't treat her well. I have been praying that they both draw close to Jesus during this time and I’ve been praying that Jesus would help her leave the house with my niece's. I really want what's best for my niece and have been asking Jesus to please help me show Him through me to my niece and to my family.