Am I wrong for not wanting my husband's mom around after learning this?

My husband already doesn't have his mom around much. She's extremely rude to me and always acted like I was in competition with her. My husband's dad died when he was 11 and his mom became extremely attached to him because she lost her husband and my husband looks exactly like his dad. Me and my husband are in marriage counseling. We were talking about my husband's break down. Last week he started spiraling and running out the house saying he's gonna kill himself. I had our kids stay in their room. His best friend came over in the middle of the night to calm him down. My husband told me Monday he thinks the reason he's spiraling is because in his individual therapy they were talking about his childhood trauma. I thought he was talking about his dad dying but he said his mom came into his room drunk when he was 13 and told him how much he looked like his dad. That she missed his dad and my husband is a splitting image and he's such a good son. Then his mom kissed him .. on the lips and he was in shock. She tried to take his clothes off and he was telling her to stop and then she passed and and went to sleep on top of him and he pushed her off. They didn't really talk about it the next morning and his mom told him not to tell anyone what happened last night because he could get himself and his siblings taken away. I asked did it ever happen again. He said no and he learned to lock his door at night. He believes it's why he has to check to make sure the door is locked 5x before bed. Well after knowing this I don't want her around at all anymore. Especially around our sons who look exactly like my husband. Hence looking like his dad and her husband. Drunk or not trying to have sex with your child is disgusting and most people don't do that drunk