Honestly she might have just abducted them. Ducks and geese will steal ducklings/goslings as a territorial thing, and also because adding another 5-10 babies means that much of a chance less that a predator will grab your baby out of the bunch. They take care of themselves more or less, so the babies don’t suffer for it.

I wonder what, exactly, helping to take care of ducklings entails?

Do they come in the house, and take over a bedroom with an en suite, watch Bluey and eat all the popcorn?

Do they just get fed on the porch?

Something in between?

Merlin says it’s a Muscovy Duck, and one of the pictures is a half yellow half black duckling so probably normal.

https://merlinbirds.org/species/musduc

Yellow ducklings turn white when they grow.

While @Catoblepas@lemmy.blahaj.zone has a good guess, Im pretty sure duck broods can have more than one father, just like cats. (I.E. multiple mates, some eggs fertilized by different fathers)