Over the past month or so my son seems to not want to be away from home, including when he was still in school he wanted to be home. We had to pick him up two days early from a friend's camper last night because he was homesick. We ruled out any issues at school and he was having a lot of fun with his friend (no concerns there about the family or anything) so I wonder - could this just be a little jealousy of his sister being home all of the time? She's 19 months old now, so why would this just start? Or am I barking up the wrong tree?

Thanks!