It's very irritating that when a grandparent is always sticking up for one grandchild even tho he's…

It's very irritating that when a grandparent is always sticking up for one grandchild even tho he's a bad ass kid always disrespecting, cusses, and doesn't listen...And when you point that out to the grandparent the get offended...That's what I'm going through right now with my mother...she's always defending my nephew and when I confront her about it she gets very defensive and now she ain't talking me since yesterday...I'm just like Wtf ever!!