be in (one's) blood

To be innate, as of a skill or quality. All of my relatives are doctors—medical prowess is just in our blood.

Name	Pronounced	Usage
Hermanus	-	Dutch, Ancient Germanic (Latinized)
Dierk	DEERK	German
Saturnino	sah-toor-NEE-no (Spanish, Italian)	Spanish, Italian, Portuguese
Babette	ba-BET	French
Rickey	RIK-ee	English
Lily	LIL-ee	English