There is are a set of twins my ds is at school with. Whilst only 1 is in his class, I know that my ds plays with both of the brothers at playtime. He wants to invite both to his party.
However, the boys have younger brothers - another set of twins less than 18 months younger than them. The mum will bring them all, she always does.
My ds is inviting practically everyone in the class - about 22 out of 27. Even this is a squeeze as I didn't want to invite more than 20 children.
I feel for their mother - can you imagine 4 boys under 2! However, I really don't want 4 places taken up by 1 invite. Is it unreasonable not to invite the twins at all?