How simple is it to reply to a kids birthday party invite? Obviously, you have kids because I’ve invited them to my kids party so you must understand how important it is for a mum, or dad, to know how many kids are coming. Not only is this to inform the party place but also so sort party bags etc. I know how difficult it can be juggling kids diaries, I do the same, but please, please can we do the right thing and reply! I even filled out the reply slip for you, all you had to do was cross the yes or no? What else can I do? Ah the joy!