You can't exactly see all of the other seb in the picture only half so I guess it's possible. I could always ask for a picture of the parents I suppose as well.
It's not mine just came across them while on craigslist lol. I was just trying to figure out if they would be worth it, from the other pics the adults look like pure whites, I know that doesn't mean they couldn't have other geese running around as well. tbh I am not sure how much they know...