My husband used to be the 'fixer' for his stepmom and grandparents. He gave up that role when he married me and became stepfather to my daughter. His stepmother complained but soon realized that he has his own family to take care of now. Saved us a lot of eight hour trips to where she lives. Her son moved in with her so he now takes that role.

I guess it depends if you want to continue having his family take up both of your time.