Are there any particular parts you want me to explain?
The most basic answer was in my first sentence:
"If he is solid lavender, and she is lavender cuckoo, then breeding them together will give solid lavender daughters and lavender cuckoo sons."
That can be re-phrased as: from this cross...
If he is solid lavender, and she is lavender cuckoo, then breeding them together will give solid lavender daughters and lavender cuckoo sons.
If you have been reading other thread you may already know this:
--lavender is a recessive gene that dilutes other colors (black becomes gray, red/gold...