You are NOT over reacting. Why couldn’t she do it herself? Or bring him to you? More than likely he’s a good bloke. But most good blokes would be like, uh, this is a bit odd because I don’t know this child. Even I, as a woman, would bulk at being asked to take a random child I don’t know to the toilet. An 8 year old, yes, okay fine because they can toilet independently. A 3 year old is very recently toilet trained and needs assistance.
I thought yesterday we were all freaking out at the suggestion of trained, vetted DBS checked male nursery workers assisting children with toileting? But it’s okay for randoms we don’t know?
One thing we need to get away from is the idea that just because someone is family it makes them safe. The statistics do not bare that out at all. Most sexual abuse of children (1 in 5 children are sexually abused) is not by male nursery workers. It’s not by your trans neighbour who might want to use the gender neutral toilet after you. It’s by trusted family members.
I have two family members who are convicted of child sexual abuse. Who knows how many others there might be. These are simply the ones who were reported, arrested, went to trial and were convicted. These people had close contact with my children in exactly these situations. Older female relatives who knew about their past, but thought, oh hey, I’m sure they won’t do it again. Or I’m sure they wouldn’t do it to MY grandchildren because I’ve been so kind and helpful to them after prison. This is how people drop their guard. Or categorise people into safe and unsafe boxes: safe because granny knows Bob well and thinks he’s a nice bloke, unsafe because that man has purple hair and is a stranger.
Now more than likely in this situation your ds was fine. Granny’s cousin probably thought it was weird, but was too polite to say anything and wanted to be helpful. I’d be having a stern word though because it wouldn’t be happening again.