I know a very close between Husband and Wife. However, we have to think of other people's feeling, not only us in so much romantic, dinner, time alone, etc. As we know, husband and wife is 24/7. Yes, we do.
I wouldn't ignore other member of family (brothers, sisters), I had a wonderful brothers, I had a great times playing with them, chatting, gaming, no complaining, etc since we were raised from the same parents.
For parents, I love them, I would definitely be there for them and give support. Why? Because our real relationship with them in 30 or 40 years longer than someone you married recently. I wouldn't like to see them getting old, imsad, make sure you don't miss valuable times as well as brothers/sisters.
I defintely respect wife as wife respect husband. I would definitely gave support her family-in-law.