I hate group pictures myself, they want organized pictures from a dysfunct./unorganized world. My wife is a queen of posers, who loves to pose.... every single picture that she likes has her posing the same way in every pictures. If you compare all the pictures from her childhood to current, it has her growing older, and the background changing.
Me on the other hand, I can't pose... my smile is all f-ed up.. it curls up and fucks up my face. Pictures in which I am in a natural situation, I would say 5 out 10 are good, as opposed to 10 out 10 are bad when I am posing.
In my opinion, take the pictures... group pictures and natural pictures.
In post, separate them and let the people who wanted the group pictures decide what they want to keep and what they want to chuck.