It's not fair on you or your older daughter, and it's not fair on the dog.
It's a huge responsibility (who's going to be cleaning up and training it, walking it, washing it, etc, has he taken the cost of vet treatment, pet insurance, food, grooming, etc into account, what are you going to do about holidays, etc).
I'm assuming that he got one from a breeder, as most rescue places demand to meet everyone in the household, and do a safety check of the house and garden. If he got it from a breeder, then it must have cost a fortune - unless he got it from a shady Gumtree style breeder (read: puppy farmer). If that's the case, the poor pup may have been taken from its mother far too young, and have a host of behavioural and health issues waiting in the wings. I just hope that your husband was responsible, but given he's just foisted a puppy on the household without consultation....
I love dogs, ours is a proper member of the family, but you need to go into owning one fully appreciating what's involved, with everyone on board.