I'm thinking of making my nephew's gf take the photo instead of being in it.
Do you not like her? Why don't you want her to be in it?
I think we can get all of the family in it if she takes the photo.
It is good to suggest the best way to get everyone in a family photo. You might offend her so you should ask nicely.
I can ask nicely about taking the photo but she might still say no.
It's great that you are a happy family that wants to create memories, but wouldn't you want to let her be a part of it too? Even if she may not be the one, she was still a part of everyone's lives and deserves a photo. How about just buying a tripod to let everyone in?