Ok little bit of context, ex and I have a DS who is 4. He lives with myself and my partner and sees ex and his gf a couple of times a week. The gf has been around most of DS' life.
Last night DS was messing about putting his top over his face laughing and giggling and said I look like I dick head don't I? My partner and I both heard, he was in the room (I wasn't) and said what did you say so he repeated it. I came in and asked where he had heard those words and he said gf said it to me, I told him we don't use those words because they're not very nice and he got really really upset. I told him he wasn't in trouble they're just not nice words.
This is definitely not a "new gf" bashing thread as we get on most of the time these days but I have no idea how to handle this. I am furious that somebody I place my son in the care of may be using that language not just in front of him but TO him but I know she will never admit it. DS started school this week and I think she will use that. What do I do? How do I handle it? It flowed out of DS mouth that she had said it to him I don't think he would make it up. Help please 