You know, I hate that saying.
I have a husband and had a mother-in-law and there was not one time that my husband ignored his mother when she needed something, & he always did for her what needed to be done. And I would include myself in that as well. DH & I had a very good relationship with my in-laws, and we both helped take care of each of them, as part of a group of relatives, as they were dying...spending hours with them at their home, so they could stay in their home, as was their wish. They died within 9 months of each toher, so it was a long year that year.
If parents "lose" their son when he gets married, there's a reason. He either married a "witch" who isn't nice to anyone or the parents have not made her feel welcome into the family.