Kay Marie & CJ,
Our husbands all sound very similar! My husband also avoids conflict and chooses to ignore the unkind and hurtful behavior of family who SHOULD know better! When it comes to our kids, though, Kay Marie, the momma lion can and should come out. Call that good for nothing adult "brother" on his behavior! You have the right to protect your son from as much as possible, and let the "adult" know that he can NOT be in your home and be hurtful, unkind or rude!
Our husbands choose the relationships for themselves, and we have to respect and support that, but abuse...should never be tolerated, no matter what. I've had to sever communication with my own father because of verbal abuse, and as much as it breaks my heart, I have to protect not only myself, but my children.
Hang in there ladies! Keep the momma lion roaring!