Sixty years for us next May. Son No. One calls every Sunday, and sends birthday/Mothers-Fathers Day cards - the other, a once a year call if we're lucky and always an excuse why no cards. We don't expect them but they are a nice gesture.
Wifey wants to split the inheritance 50-50. Don't think so.
I figure if one is more reliable than the other they get the say in my will....and extra for carrying out my wishes.