His father is British, and his mother is Italian, so he has mixed blood.

blood 的本义是"血液"，在比喻用法中可以表示"血统、家族关系"或"气质、性格特征"。 mixed blood 这个短语字面意思是"混合的血液"，引申为"混血儿"或"混血血统"，指父母来自不同种族或民族的后代。