Africans can be pretty aggressive. I have heard of some that wouldnt even let people pulling into the yard out of their car,lol.
They are still my favorite breed of goose.
My Africans are only a few months old, but they have been good. I have young children and no issues there either. I don't consider them loud, but I live out in the country.
How old are they? At 8 weeks or older Purina Flock Raiser is excellent for geese. The love a green yard to graze and with a nice place to roam and graze they will eat less feed. They are herbivores and do not eat bugs or worms etc. Nice vegetation and plenty of clean water makes them happy.
I would plant a good cool season grass for them to eat this winter. I am planting as we speak, some oats, wheat, and ryegrass. I may throw in some clover and winter peas also. they are higher protein.