I am starting to plan my ds's 4th bday party late May. First 2 years it was covid and last year we barely had children his age as he didn't go to nursery until Sept and didn't know any kids his age. The birthday falls on half term but flexible with the dates but would love to use the half term as an excuse to exclude someone.
My ds gets on well with a few kids in his class although they have minor quarrels sometimes as normal 3/4 year olds would when they want to have a go at something first but a kid in particular he gets on really well with has a six year old brother. The mum is absolutely lovely and ds's friend too which we all get on well but the six year-old brother is too disruptive and changes the dynamic. We've been to play dates and they've come to mine too once (once was enough) and it was carnage hence why I avoid going there and always make up plans to get out. My ds and his friend happily play together with no issues but the older sibling would try to be rough with ds, spoil the puzzle, kick the Legos ds is building, pull one of ds's legs and drag him along the corridor and do anything to wound my ds up.
My ds and class mate have such a lovely friendship but it's often ruined by his older sibling which is such a shame. I really want this kid to come to ds's birthday but really don't want the older sibling to come as it will completely change the dynamic and overshadow ds's birthday which he has been patiently waiting after attending all his friends parties until now. The mum is a single mother and she has nowhere to leave the sibling so he has to tag along even if I say "no siblings please" plus it will exclude the other parents who have babies etc where my son also plays with their preschoolers.
How do I tactfully get out of this. I don't want to cancel plans just because I don't want that sibling but also don't want to exclude the mum as we sometimes go for coffee before picking up the little ones and they will find out and it would be quite hurtful. Everyone so far has done whole class parties but the thought of the sibling coming along and invading the party horrifies me.