To take after somebody is to look or behave like an older family member. Take after his father, take after the mother's side, who does she take after.
It works only within a family, so you cannot take after a friend. It covers looks and manner alike, and the speaker usually means both.
1phrasetake afterTo look or behave like an older family member.
“The boys take after their grandfather more than their father.”
take after is a phrase.
Also accepted in games: resemble
Practised in Family & People, Phrasal Verbs