DD and DSD are 7/8 and mostly get along great. However, DSD is quite spoilt/temperamental and in the past has spoilt birthdays for DD. For example - she's opened all her presents, she's demanded to be taken home during a birthday trip to the zoo, she's purposely been mean to/ignored DD at her party and tried to encourage DDs best friend to do the same. This year, I'm thinking of planning DDs birthday party for a weekend when DSD isn't here to avoid the same happening again. It's a friend party rather than a family one but AIBU to plan it without DSD there?