Lol my 7 year old sister likes monster high! But anyways, I think you should make half of the party one theme, and the other half another. Like say it's from 3:00 p.m. To 7:00 p.m. Make 3-5 the seven year olds party, and 5-7 the 1 year olds. Clearly state on the invitations that it is a birthday party for two. But don't tell them how you will divide the time or they might only show for one. Lol the separate cake/cupcake table is perfect. Just save one for the other half. That sounds like it will be fun, I hope I helped!! Good luck! :)

Put both on the invitation.

I have two daughters that share they same birthday. July 8th. Just 6 years apart. So one will be 7 & the other will be 1! The 7 year old wants the "monster high" theme and I've decided "lalaloopsy or Coraline" theme for the second. I would appreciate any suggestions on combining the two themes. Like how combine the invitations? I was going to do two seperate cake/cupcake tables..?? (Were getting a blow up water slide)