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
Eustathius	-	Ancient Greek (Latinized)
Amandus	-	Late Roman
Constance	KAHN-stənts (English), kawn-STAWNS (French)	English, French
Alasdair	['æləsdə]
Ilsa	IL-sah	German
Mari (2)	-	Mythology