I'm organising my son's 4th birthday party and a mum (from nursery that I don't know personally) said her child will be attending- after the RSVP deadline passed, might I add - but has asked if his sibling can come too as she doesn't want her to miss out.
Despite having missed the deadline, I don't want to exclude this child as he's my son's friend. But, I'm wondering if it's unreasonable to message back to say that the invited guest's sibling can come but I'd like her mum to pay for admission since she wasn't actually invited (in a more tactful way than this - any help on wording the response would be appreciated). I'd still make sure she had cake and would pay for this. I should add that, as the venue is soft play, paying for admission separately would mean she can still participate in the party with all the invited guests so she wouldn't be left out at any point.
Again, any help wording a reply would be great!
TIA