My 6 y.o has 3 freinds (M,A,and T). One of their mums has just rung up to ask if I could take her son and mine to Ms party. We havent got an invitation so I said that I couldnt answer her till Ive got my son to check his draw at school for an invitation. He is quiet forgetful so it wouldnt be the first time hes forgotten or mislaid stuff. So, my question is, given that the boys play as a 4 etc shall I check with M`s mum to see if we should have an invite or is that rude? (there are 3 boys with my sons name in his class so lots of scope for erroe etc).