My DC is almost 4 and has made a new friend so we have arranged a few playdates. Its starting to annoy me as the mum is bringing the older sibling, and not letting me know beforehand. The whole point of playdates to me is for the kids to bond 1:1, not to mention her DC is very shy so the sibling dominates. AIBU to say the sibling shouldn't always tag along. None of the other parents do this on playdates.