Goslings Brooding Ducklings?

[aaronburton87]

My goslings appear to be brooding my ducklings even though they are all the same age. Is this normal?
I bad issues with aggression for yhe first day, so I want yo make sure this isn't dangerous.
Video shows them settling in for the night

 

[sourland]

Just ducklings taking advantage of the security of contact with a larger bird - not dangerous.