I am NOT judging the situation in itself, but briefly.
DC's have friends who are brother and sister, of same age to them (my DS12 and my DD 8, the friends are also 12 and 8).
They live with their Mother and her Ex boyfriend's father who is registered disabled, from what I know is an alcoholic with MH issues.
They all share a living space in which the two adults smoke very heavily.
My DC's have been friends with them for about 7 years and I have a friendly relationship with the Mum but we are not close. They have played at this house which I have been reluctant about as DD especially is asthmatic and whatever I think of smoking, they come back smelling badly of smoke. But I let them play as the friendship is so long standing.
About six weeks ago DS begged to go for a sleepover to which I agreed.
During the course of the night, the Man had an 'episode' in which he was verbally abusive to my DS, threw things and in the process of his problem, threw himself over a sofa which resulted in DS being kicked in the head, although he was 'OK'. He then locked them all in the house for a short period before coming out of his room and taking an overdose infront of the DC's. The mother did not contact me, the police and ambulance were called and I did not find out till the next day when the DD came to play with my DD and let it slip.
I have to admit that I banned them from going to the house which doubly suited me as I am not happy that they are exposed to such a heavily smoky atmosphere.
The Mother is slightly 'off' with me now and the DS had told my DS that it is, and I am, stupid to continue banning DS from going over there after all this time.
He/they is/are welcome to come here but mostly won't, if DD's want to play together they obviously have to come here or go out.
The man is 'calmer' and apparently these episodes are rare although he has some obvious issues.
I get a heavy feeling at the thought of them going there but don't know if I am now over reacting.