DD2 (3y) would like to invite a friend from nursery for lunch, but not the girl's (male) twin! I feel very awkward about this - I'd be fine about it if they were older but expect they still do pretty much everything together at this age. It's not long since this would've been a sensitive situation even for my DDs (19m age gap). I certainly don't want to upset the little boy, altho tbh I do find more than two 3yo's a bit of a handful anyway. So I've been stalling ... Any thoughts?!