Unfortunately I don't remember Bubu's parents, but I have seen his brother last year when I picked Angelina up, and he is a very pretty young gentleman, he's a visual whiteface and he's now one of the breeders.
Who knows what Bubu's destiny and job would have been if he stayed with the breeder... I had the choice between him and his brother, couldn't choose so the breeder chose for me. The rest is history
Sadly I have no good pictures of him as a baby, I didn't even have a phone with a proper camera.
This picture below was taken the same day after he arrived, or the day after (can't remember precisely!), very blurred but you can see the line above his beak.
I knew next to nothing about cockatiels at the time, what a shame I lost record of so many things!

Here he's 4 months old and the line has already started to disappear.
He also had other white markings on his face, notably two "eyebrow" spots, they all went away at about that same age.
