Welcome to PTO!
Hmmm, "quiet" geese you say? They don't exist. Muscovies are VERY quiet, Egyptian "geese" are quiet, but neither of those are actually related to geese at all. Anything in the anser family is LOUD, but if your parents have their heart set on geese, and value peace and quiet, get only a pair (much quieter in a pair than either alone or in a flock) and never allow the female to sit a nest. As an only pair, they will still yell occasionally at passing traffic, or the dog, or an airplane flying overhead, but they won't be honking every five minutes.
An alternative would be to get only females--their honks tend to be much less obnoxious than the males. Any kind of (actual) geese they get will freely interbreed with any they already have, and then the noise results are less predictable.
I highly recommend muscovies. Females make a quiet "boop" sound if disturbed or broody, and will SQUACK (though not as loud as regular ducks) if frightened, and males just generally make quiet huffing noises. They are generally quiet, peaceful birds. Even their Spring jostling for mating rights is silent except for the odd flapping noise. Only downsides to muscovies are: 1.) They are almost as vulnerable to predators as regular domestic ducks. They are lovers, not fighters, though I once had a fat elderly drake drive a hawk off a duckling and then chase it 12 feet into the air. 2.) They fly. Quite a lot, especially in Spring, and especially young females. If you don't want to chase them down off of a neighbours' roof, clip a wing. 3.) They are pigs. They will hoover great quantities of food, any food, and some things no sane creature would consider to be food; so fast that any of your other birds might not have even got a look at it. They will readily get fat if you let them. An upside to this is that a: fat birds don't fly, and b: such a food-centered bird is very easily hand-tamed if you're so inclined. 4.) Being a flying and "roosting" species, their claws are MUCH sharper than regular duck claws, and their legs and feet are stupid strong, especially the males. The claws don't LOOK like much, but actually are almost talons. If you pick one up that is not used to being handled, or just doesn't want to be, and don't control their feet first and foremost, you may find one of those claws has gone right through your hand or belly. Most other poultry are picked up by holding their wings on either side and simply hoisted up. Muscovies don't generally like this at ALL and will flail feet until they find purchase. In your skin.
Jeez, wind me up and watch me go
ANYWAY, a most hearty welcome to the best poultry forum in Ontario!
