Well cool glad they all have made peace and become friends.We were gifted two baby mallards just last night. They're about a week younger so there's quite the size difference now. There was only a little bit of roughhousing when they were introduced. Our gosling was the youngest by a few days but she's now the biggest for sure.
EDIT TO ADD: we lost the little gosling pictured above. It had a crooked beak so I'd like to assume it was bad genes. The one we have now is happy and healthy. Our goose hatched 2 of 6 eggs for us
Very sorry for your loss too.