I’ve never seen a normal asian-caucasian mixed person with light blond hair. That might occur in special cases like albinism, but in normal genetic conditions it’s nearly impossible. Each parent needs to have a recessive gene to have children with blond hair. That’s very unlikely for the father, as he’s of Asian decent.
Edit: Normally asian-caucasian children have light to dark brown hair, as well as eyes due to a mix of both the parents’ genes.