When did you take the last family photo? It doesn't always need to be a photo studio, even a family melfi with your cell phone can be nice. The main thing is that you have fun! You can find ideas for family photos on Pinterest. You could choose an idea together and then try to add it.
Tip: With the "Canva" app, you can, even with a free version, create beautiful Christmas greetings.
I bet that you will have a lot of fun.