Your going to have to supervise till you know the babies and adults have bonded, once that happens like psue said the chickens will have to watch out for the geese because they will not tolerate the chickens getting close to those babies. And if you have chickens loose and haven't had any problems with hawks hopefully the 2 gosling won't bring them in especially with the 2 adult geese watching over them, but we all know when we free range out flocks there could be problems.I have 36 chickens on my 1/2 acre back yard mostly free range. The pair of geese are free as well, and sleep in the shed and I "herd" them in at night. On occasion I've seen mr. Goose give a little nip to a chicken to get the treat. Nothing serious.
The chickens don't hang out with the geese. They don't seem to mind eachother.