This is a bit complicated so I will try and be clear...
My MIL's sister's husband has grown up children from another marriage. One of his sons had three children with a girl but they both have serious drug/alcohol/anger problems. The children are one, two and a half and four years old and all seem to have serious issues due to witnessing God only knows at home. As a result of this, SS have allowed for the two older children to be looked after by my MIL's sister and her husband (their Grandad) pretty much every weekend. Because of this, we see them quite frequently with the two children. (Two year old boy and four year old girl).
A few weeks ago we were all visiting my husbands grandparents (MIL's mum) and the boy was there. In less than 30 mins we witness him kick my husbands Nana in the leg (she was asking him to drink his cocoa) and call her a c*t. Before telling her to fk off. His guardian (MIL's sister) just sat and laughed and said "that's nothing, you should hear what else he says". He then sat in the middle of the kitchen telling us to fk off and f*k you.
A few weeks after that we left our 6 month old DS with my MIL for a day for the first time. Naturally we were already nervous about this. It didn't help when we arrived as saw her sister and the boy were there. The kids have taken a fancy to my DS which is mostly quite sweet to watch when the boy is not being abusive. This day he gave my DS a kiss. It was sweet as he was gentle and was stroking his hair. Then things got weird. He started to stroke a little to familiarly then starting putting his tongue in my DS' mouth. I stopped him and said firmly that 'that is not the way you kiss people, a peck on the cheek is fine'. His guardian just rolled her eyes and said "Alright he gets the picture - you like him".
Now I am terrified of this boy being anywhere near my DS. I'm in a pickle because half of me wants to tell him off and teach him right from wrong (as nobody else does), and the other wants me to adopt him, give him a cuddle and provide him with a loving home. I know that my MIL's sister cares for him but after I asked her how she could let him get away with all of this, she said that she's tried disciplining him when he's with her, but then he goes back to his parents and comes back three times worse. Apparently Social Services have been useless at monitoring them as they are still abusing drugs and being arrested every other weekend for fighting each other in the streets and causing disturbances. Apparently only last week the father was feeding lager to the boy and telling him he wasn't a man!
I'm really stuck between a rock and a hard place here. My main priority is the safety and well-being of my DS so I don't want them to have much contact, especially as they grow up and he becomes more influential. On the other hand I want to help the other boy too.
Sad situation.