Is grandpa half-blood?

not half-blood.

Half-breed refers to the children born by crossing different races. Descendants of different races are also used to describe certain mixtures, impurities or things of unknown and unreasonable origin.

the biological definition of mixed-race people is the offspring of parents with certain genetic differences.

Spaniards-including native whites and peninsulas-Indians and blacks mixed with each other during the colonial period, resulting in various mixed-race people. Roughly speaking, people with lower economic status, Spanish immigrants, skilled and unskilled workers, intermarry with Indians more often.

Many Indian women and even black women have given birth to the descendants of native white landlords. As far as all these hybrids are concerned, the fastest-growing group in the colony is the mestizo, that is, the descendants of the Spanish and Indians.

Europeans and blacks have descendants of mulattoes, whose situation is similar to that of Europeans and Indians. Besides them, there are also various other mulattoes produced by the combination of Indians and blacks, mulattoes and Europeans and Indians.