So here is the composition of my family :
Me = French, born in France, from a deep rooted French family tree

My husband = British by descent. Born in South Africa. From a British mother and a British by descent father. Both his grand-parents are deep rooted British.
First daughter = born in England. In the process of applying for dual citizenship (the procedure is free and easy in France).
Second daughter = born in France >> We are trying to figure out if she can apply for British nationality too.
We are going to move back in the UK next year, i don't know if this information is relevant or not.
I didn't mind before, but with Brexit, things seem more complicated now.
Thank you very much for your answers.
Cecilia