My only experience is with American Buff geese; I got the last two goslings at the local feed store and lucked out that they were both female. Gussie and Golly are sweethearts. Yes, they will occasionally hiss, but they big scaredy cats at heart.
They will occasionally peck at a lone chicken, but if two or more chickens approach them, the goose girls run off. Once in a very great while, one will take a single nip at a chicken if treats are involved. They do like to herd the runner ducks, making the ducks run ahead of them for no apparent reasons; it ends as quickly as it begins.
They explore everything with their mouths, which incudes me sometimes, but they're not nipping me, just checking me out. They're not clamping down hard.
Initially, I thought Golly might be a male because she got very protective when Gussie laid her first eggs. Then, Golly began laying, too. She's always been the stronger personality and apparently just wanted to guard her little sister.
I can, when necessary, pick up the slightly smaller Gussie without incident. She will, obligingly, lay her head on my shoulder and let me move her. When I have to relocate Gussie, I can expect much more resistance, and often, a wing to the face as she tries to escape.
Since you already have ducks, you know how messy waterfowl can be and bigger birds mean bigger messes. Mine cannot resist the urge to bathe in any and all water, including the others' too-small water dishes.
But they are beautiful and have tons of personaility.
Gussie and Golly can achieve liftoff, but are only able to stay airborne for a few second, mostly doing zoomies down the driveway. When they want to cross the 2-foot wire fence meant to keep ducks from going astray, they don't so much fly as they just walk over it and bend it to their will.
I hope you get your geese and your mom learns to love them.
