My brother-in-law was visiting our house with his 13 year old son, and he was trying to give his son a beer.
I just looked at him and said “Not in my house”. I told my husband what happened, and he said “good for you” and backed me up (of course).
My brother-in-law isn’t welcome in my home anymore.
I feel sorry for his kids.
And I feel sorry for you as well.
Life can be tough enough without having such discord within one's own family.
May God Bless you and yours, as you've done the right thing, which, as is quite often the case, not the easy thing to do.