DS1 has been invited to his first birthday party (first child - we're very new to all of this!). We received the invite from the nursery staff (all of the kids in his class get picked up at slightly different times, so we hardly ever bump into the other parents) and they told us it was an invite from "X". I assume the whole nursery class has been invited as we don't know the parents personally. The invite says its for a joint birthday party but we don't know who the other child is - in fact, strangely the invite does not include the names of any of the children! It just says its a joint birthday celebration, has the location and RVSP details listing the names and numbers of two parents - I don't even know which one is the parent of X. I assume its not with another child at nursery or else nursery staff would have said it was from "X" and "Y".
We'd love to attend and are happy to bring two gifts for both children but I'm just not sure what the right etiquette is here. Do I RSVP to both parent contacts and just introduce myself and try to figure out which one is X's mum / who the other child is? Shall I ask the nursery staff? Is it strange to bring a gift for the other child if we don't even know their name / DS does not know them?