I have two Great Pyr mixes (and we also have a baby due in June).
Pyrs are great dogs, but they're not for everybody.
Based on your post I'm assuming you're in town and this is going to be a pet Pyr instead of a LGD.
You have to have a well fenced yard (6' fence). If you don't, they will jump it and go on a walk about. Pyrs like to roam, so a secure yard is necessary, especially for pets that don't have sheep/goats/livestock to guard. You're also going to need to exercise them with daily walks, etc.
Speaking of neighbors and yards, Pyrs kept as pets almost have to be kept inside at night. Night time is when they bark to scare off predators and alert others to danger. If they're left alone in your backyard in the dark, they will bark at everything. Trains, cars, falling leaves, their own farts...everything. They also have a booming, loud bark...so your neighbors will hate you. I keep mine inside and they only occasionally bark at night. But if you can't take any barking whatsoever...don't get a Pyr. They're going to bark, it's just in their nature as guardians.
They are stubborn. You mentioned a husky so you're somewhat familiar with stubborn dogs. Pyrs are more stubborn than Huskies, IMO. They were bred to be smart, independent animals. If you want a dog that's easy to train, don't get a Pyr.
They're also huge. My two are mixes. One is 65 lbs and the other is 85 lbs. Most pure bred Pyrs top 100 lbs easy. Speaking of size, their double coats shed a ton and require a lot of maintenance. You have to brush them out at least weekly and daily is better or their coats get matted. Thanks to their long hair, they also tend to drag leaves, sticks, grass, and anything else they can find from the yard into the house. They also tend to be "jowly" in the face and so a lot of them drool some. If you're a neat freak, a Pyr is not for you.
Now, that being said: My two (and most Pyrs I've ever been around) are incredibly great dogs to have around kids. They're patient, gentle, and kids love them because they're like giant fluffy ponies. They will "adopt" your kids as their charge, and love watching/protecting kids. While protective, they're also friendly to new people and not overly aggressive...though they do pick up on cues and I have zero doubt my two would go after anyone trying to hurt my wife or a kid.
They're also pretty calm once they get settled. Mine spend most of the day napping on the couch (they're a lot more active in the morning and in the evening).
So if you can handle a big dog that sheds and needs to be kept inside at night and has some exercise needs, I think the right Pyr is one of the greatest dogs to have around kids because they are so gentle, protective and make great companions.
Check out an organization called Bluebonnet Animal Rescue Network. They specialize in big dogs like Pyrs, Anatolians, etc and can help guide you towards the right dog for your family from their big collection of dogs who need homes.
http://www.bluebonnetanimalrescue.org/My two Pyrs doing what they do during the day...napping:

If you think of any other questions, let me know.