spangle mutation question
Hi i have a question about the spangle mutation, I have 2 birds currently in the breeding process & on thier 2nd run (this was unexpected btw as the female went out of season just after the last chick was born then came back in a few weeks later). In their 1st clutch they had 4 chicks, 3 boys & a girl, there mutations & colour were as follows-
Boy 1- sky blue normal
Boy 2- sf yellow face, sky blue grey wing
Boy 3- cobalt normal
Girl- sf yellow face, colbalt, grey wing, dominant/ recessive pied (combo pied i think)
Also just want to be clear on something, boys 2 & 3 have small pied patches on the back of thier heads does this mean they are split recessive or something else.
Now the parents are as follows
Female- Cobalt, greywing, dominant/ recessive pied
Male- yellow face type 2, spangle
Now my main question is can any chicks get the spangle mutation from the dad or was i just unlucky with the 1st clutch?