My mom is forcing my son to lie to me

I am going to try to summarize this, because I really need advice.My brother is an addict. I love him, but the things he says and does is not ok in my book. He lives in my mother’s house, while she lives with her husband at his house. They are redoing my moms house.My mother, her husband, and my brother came to my house to help me remodel my garage. I was borderline with him coming here. Flag 1.Flag 2. I do not allow alcohol at my home. He had my mom buy him alcohol the whole time he helping with the garage, even though they know how I feel.Flag 3. My brother, while drunk, got in my face. Literally nose to nose while he drunkenly told me that he wasn’t leaving my house to go back to the hotel. My mother and husband stood away and watched this Jerry springer shit show on the lawn.I told my mom he wasn’t allowed back here. She begged me to let my son, (12) to still come for a visit (they live 5 hours away). She loves my son to death and I didn’t want punish her because she doesn’t know how to handle my brother.I said he could go as long as he was never around my brother. They agreed.I FaceTimed my son today and asked him what he did. My son does not lie to me. Or if he does, poorly. I knew immediately he didn’t want to tell me something. I asked him who was there, and he had a single tear run down his cheek. I told him it was ok, I’m not mad. Was uncle Corey there? He nodded yes.I’m so furious. How dare she put my son in a position where he is conflicted on telling me the truth. I mean I’m mad that my brother was around him. But not nearly as mad as how she made my son feel.I want him back now. I want to yell at her. I want to scream at her that I raise my children to feel like they can tell us anything and she threatened that.But I have grown out of that dysfunction, or at least when I’m not around them (I can’t believe I screamed on my front lawn at him). I just need advice on how to tell my mom I’m pissed worth out sounding like I belong on Maury or Jerry springer.Please, please help. I just want to to say the right things. via /r/Parenting https://ift.tt/3ktHIYK