In the/somebody's blood/genes - Idioms by The Free Dictionary
in the/somebody's blood/genes
in the blood
Innate, as of a skill or quality. That type of passion can't be taught—it's in the blood.
in the blood and in one's blood
Fig. built into one's personality or character. John's a great runner. It's in his blood. The whole family is very athletic. It's in the blood.
in the/somebody’s ˈblood/ˈgenes part of somebody’s nature and shared by other members of their family: Both his father and his mother were writers, so literature runs in his blood.