Hi nice birds.
The first is a YF2 sky blue spangle boy (I have 2 exactly the same), the yellow could be a double factor spangle, and maybe the third is also a double factor spangle. If the last two have red eyes, they may be lutino and albino.
I am not great at this so I'll see how I went when someone else replies.
Lutnio and Albino (ino) are sex linked mutations. This means you have to have a male that either shows or is split for albino or lutino to get chicks that show albino or lutino. A albino or lutino female with a none albino or lutino male can only have males chicks that are split for albino or lutino.
Oh ok. Im thinking when this lot out of quarentene i was going to put Ghost the white one and Zohan my Harliquin togther give zohan a new mrs atm he is with a Lutino hen but i will add a pic of zohan and ghost. Ghost is in the first pic tho in this post but am thinking they may b my next pair i put n nest box when get back from holiday here there pics Zohan and Ghost.