As hard as it is, there really isn't anything you can do. This really makes me mad because I grew up around it, with my dad, which was bad enough, but I couldn't imagine 3 people doing it. That is like she is inhaling 3 + packs a day! I feel for you because I'd be livid. It's one thing to be a smoker, but to do it around a child who can't get away from it and who is already having problems breathing is disgusting That's just plain selfish and wrong. The only option would be to have your husband have full physical custody, or get a letter from the DR saying her health is suffering and give it to her mom, in the hopes these relatives wise up (highly doubtful though). I am sure the poor kid is miserable because smoking would make her allergies worse. Who knows? She may be having these issues because of the smoking and may be fine once she is away from it all. Since her mom is living with her relatives, it's their house and their choice, as awful as it may be. She could move, but other than that, there is nothing that can be done.