I have been married for 20 years and my husband cannot let his stepdaughter be free.?

The first time I noticed something was strange to me, was my husband would go to bed with his 13 year old daughter whenever she had nightmares as he called them, sleeping behind her very close. However, now my stepdaughter is 31 years old and married with 3 children of her own for 13 years and told us she is very happily married ( I married them by the way and proud of it). She is able raise her children and loves her husband deeply. My husband does not like our son-in-law and refuses to move out of state or even the next county, said he is afraid for his little girl and does not trust his son-in-law. I am feed up with this because, we have educated our stepdaughter, isted with any family issues and she loves her husband. My relationship with my stepdaughter started off good and then we had a few issues (mainly due to her mother being jealous of me the stepmom), but we have a really good relationship now that she is old enough to understand about life and relationships. I believe my stepdaughter and husband need their space to continue growing and raising their famiy without my husband learking around. My stepdaughter and son-in-law seem to do better when they are left alone. They know if they need anything we will be their for them. They are stable and I love them both very much, we are always there for them. I am enjoying being Nana (7 grandkids). However, it is time for my husband to concentrate on our relationship before he looses me. Help!!!