Invite question - kids from previous marriage

MJandDL

This is probably a dumb question but I just want to check. FI's uncle recently got remarried. His wife has taken his last name, but she also has two younger kids that now live with them. I'm positive that FI's uncle has not adopted them, and I think they still have their father's last name (though I will be sure to check). If this is the case, do I put them on the invitation under "Mr. and Mrs. Uncle Lastname" as "Joe and John Differentlastname" or not use their last name at all? I'm under the impression that if you leave off the lastname, it implies that they share the same last name as the adults listed above, which they don't. Please advise! Thanks!

Meegles4

I would use their correct last name and list it as you specified. If you're not absolutely sure, ask FI's uncle.

brilibby4

I would double check on their last names just to be sure, and then include their last name.

Loopyseven

I'd include their appropriate last name.  Also, putting them on the same line with an "and" signifies that they are married - to each other .  It would be:

Mr. and Mrs. Uncle Lastname

Joe Differentlastname

John Differentlastname 

address

city, state  zip

which looks really long on the envelope, but is the proper way to address it.