which one has mated with the grey female?
Do you know if the grey female is split for anything (if she has a white spot on the back of her head she would be split for pied)
It is very hard to predict an outcome as you would need to know exactly what the birds are split for but you can give it a go over here:
I have a breeding pair of tiels and my male was split for pearl which I didn't know.
Nice surprise to say the least as I ended up with a pearl baby but also a stunning pied pearl baby (have kept both plus another pied, they're all boys so lots of noise in my aviary
The last tiel looks like a normal grey to me, is he young still?
He might still be colouring up in his face............
The white one is a whiteface pied I would say, very pretty.
I am not a real expert on mutations though so don't quote me on the whiteface pied mutation