Geese are what you make them. Seriously. The geese I hatched imprinted on me. My kids are always around when I feed and care for them or go out to visit. The geese do not like my 10 yr old DD. They do try to nip my 2 yr old DS if I turn my back on them. Geese pick their human. You don't pick the goose.
For the most part though if you hatch your own goslings, have the child feed and tend them daily under your supervision, the geese will accept them into their flock. I find my sebbies to be the sweetest. My barnyard toulouse and giant dewlap toulouse are next in temperment. I had some others with Africans in them and they were just mean. My embdens aren't real friendly either.