How do you feel and react when your own husband is so rude and shows attitude to your mother??

It has happened to me and it still happens from time to time. I couldn't explain the feeling as I feel hurt for my mom. My mom has sacrificed a lot for our family especially to my 2 kids, but the husband always gets furious when my mom reacts whenever he scolds the kids. Of course, any grandparent would react the same way too. It has been straining our relationship and I am still thinking of ways on how to put an end to it.