Bday party invite question (sibling names)

CD+AL

Most of DS' school friends have older and/or younger siblings.  I want to invite the entire family including siblings and parents 1) to make it easier for them to attend and 2) there are only 9 kids in DS' class including DS so it's small enough that it's not a big deal. We're renting a room for the party, so we have plenty of room, and we're doing our own food, which makes the cost pretty minimal for each extra person.

The only problem is that I don't know all the siblings' names, so do you think it would work to just address the invite to "Classmate and Family?"  Is this totally tacky?  I suppose I could just try to catch all the parents at pickup/dropoff and ask, but that's next to impossible even with small numbers.

the_jackpot

Classmate and family works well.

Sawyerplus1

the_jackpot:

Classmate and family works well.

Agreed. 

howleyshell

If you want to be sure that you're being clear I recommend putting:  "Siblings welcome" directly on the invitation.

Many people don't pay attention to how an envelope is addressed but will see the specifics of the party on the invite.

kes77

I don't think it's tacky at all!  Totally fine.

byrne15

I think Classmate & family is perfect fine

franciscaz

This was the wording for Harm's party: Thomas the Train and his Friends Choo Choo Choose you and your whole family to join us in celebrating Harmon's Birthday. We will have food, jumping ballon, and tons of fun for all ages. Come celebrate us make Harm's special day one of a kind!

CD+AL

Thanks everyone! 

jlw2505

I would address it to the "last name family" or simple address it to the child and on the inside on the RSVP's put something along the lines, the whole family is welcome to attend, please let us know how many adults/kids will be attending.