Oh my my my. I just looked at the chicks again. Look at the youngest chick - it has a pied patch on its head!
I am actually starting to wonder now. Going by the brightness of the yellow, and the presence of pied in the third (and possibly the one on the left?) i think the chances are midori is the biological father! Jessie may be raising them, but i have some seeerious doubts now about these chicks being his! They are opalines like jessie, but then midori is opaline too...
Just in case, this might help you judge the parents based on the outcome of the feathered up chicks:
Dominant pied opaline spangle light green cock (midori) X SF violet sky blue opaline spangle hen (lamey)
If midori is NOT split for blue you could get any combination of:
100% light green chicks split for blue (no dark factor)
50% single violet factor
50% dominant pied
25% normal, 50% spangle, 25% double factor spangle (clear yellow bird)
Multiply the chances to come up with outcomes for specifics. Eg all chicks will be green opalines, so ignore that. To also get a dominant pied violet spangle you have a 12.5% chance, roughly 1 in 10 chicks (50% violet x 50% pied x 50% spangle = 12.5%). To get a dom pied violet with no spangle you have less chance - (50% x 50% x 25% = 6.25%).
If he IS split for blue, then you have the same chances of all mutations, except instead of 100% light greens split blue, you will get 50% light greens split blue, and 50% blues.