Well that's a fine how-do-ya-do.

A humble baker is getting ready for bed when there's a knock at their door. They open it to see nothing but a small basket containing a very strange baby.
AKA, Scrapjack's parent finds her on their doorstep! They always joked that if they were ever to have kids it would be through some kind of weird situation like this, so they figured they may as well put their money where their mouth was and raise the little anklebiter. I don't actually have a name for them yet, but once I think of one I'll update this alsldjajfljlgd. I know they use they/them pronouns though! And of course they have a very prominent Australian accent, which they passed on to their daughter.

EDIT: Their name is now Lamington!