When that incident happened back in Feb. I called up my husband's sister (me and her talk alot about his drinking) and I told her what happened. She told me that if ever I needed to be somewhere and I needed someone to look after my son, then to call her up.
But I can see that if I did this and then his sister shows up at the door, he will be pretty pissed off that we don't trust him to take care of his own son. My sister in law said too bad if he gets pissed off. But then I have to live with him thinking that I don't trust him.