I've got 3 step-children, and 6 bio-children. 2 of my bio children are DP's.
DP shares 50/50 custody with their mum. It's all very amicable.
Step-children are going on holiday in the summer holidays to Disneyworld, Florida. This is something that my children would love to do but we can't due to finances.
Also, my 4 children with a different dad sometimes go places like theme parks with their dad, that the two with DP can't go to.
How do you make it special for the ones who aren't doing the fun activity?