Did you know there isn't such a thing as hypoallergenic dogs
? For more info:
http://en.wikipedia.org/wiki/Hypoallergenic_dog_breed
Your best bet would be to spend time with a particular dog to see if you react. In terms of family friendly dogs, are you looking to adopt a rescue? Foster homes where there are puppies or dogs living with young children would be able to tell you how they are with kids. But it would be up to you to teach your children to properly interact with a dog you aren't familiar with yet.