You do understand though that he might not be homozygous for tobiano pinto ?
Even though sire and dam are pintos, and he clearly recieved one gene, only dna testing would prove he has received two genes (one from each parent) to be a homozygous tobiano pinto.
He is a beauty no matter which he is homo or hetero!
CONGRATS!!! He is so adorable ...I am expecting one just like him in Sept, Parents look simular, I hope mine is as lovely as your boy!!!! And love his name, our name is Hart...small world....