My tongue should fall out on the floor for promising to look after your brother and not doing it.
Until he was released at Christmas, she looked after her younger brother in the house of an elderly couple, afraid to go outside.
She looked after her brother, but that was her duty.
He was supposed to look after his brother at all times.
Very nice - you look after your younger brother.
She often looked after her younger brother John, who was born with a mental handicap.
"I used to like watching them play and how she looked after her brother."
Robert was charged with looking after his brother by their mother.
Consequently he killed his parents and looked after his brother.
"Do you think I have nothing to do but to look after your brother?"