There is no such thing as a living homozygous overo. Those are lethal whites. They die within 24 hours.
If the sire is really cremello, the only possible outcome from a chestnut would be palomino. The champange thrown in there, idk.
Id like to see pictures of the potential parents.
Frame overo can HIDE on a solid colored horse as well. So even quarter horses carry it. Best to test. Posted via Mobile Device