We have known this family for a year or so. They have two sons, one is around 4 and the other is 2 and a bit. We've been to their house several times, and it's fab, the kids all play together and we adults get on well.
Our DD (2y 3m) needed changing, and the 2 yr old boy came and watched (with me sort of blocking the door). I thought no harm at all, he is a toddler, and couldn't really see anything. But the next time we visited, when we went to change DD, the older boy tried to come and watch, and I had to basically bodily block him from coming down the corridor to the bathroom! His mums didn't notice I think, and because we're quite new friends I don't want to say anything to rock the boat.
Is this normal for a 4 year old? And does anyone have any advice for preventing this happening again, other than directly complaining to the other parents and risking a misunderstanding with the other, lovely couple?