彼は大家族を養わなければならなかった。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

big; large

family; members of a family

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to support; to maintain; to provide for; to bring up; to raise; to rear; to feed; to adopt (a child); to cultivate (a habit, a quality, etc.); to develop; to build up; to recuperate (from injury, illness, etc.)