Will Geese hatch and raise other types of birds

[Kimmyh51]

What I haven found works well is to hatch inside and then introduce a big group of babies to the geese when they are a little more " squish-proof". This year one of my ganders raised 19 geese and ducks together without losing a single one. They were all hatched inside and a few days diffference in them. His mate was setting on one dud egg and eventually joined him. The ducks will mature and leave the group on their own, but the juvenile geese stay with the adults until next breeding season.

What age do you put the ducklings with the geese? And what breed of ducks?
So will a gander brood ducklings? (Or geese?) is sit above them with his wings out over them to keep them warm? My gander went all Gaga over a couple of clutches of ducklings last year but it never occurred to me he might brood them....as a duck rescue that would be handy... does the gander need to have a mate on eggs before he will do that?