法律上

fǎ lǜ shang tā bù shǔ yú zhè míng nán zǐ de jiā hù

法律上她不属于这名男子的家户。

Legally she's actually not part of this man's household.

zài fǎ lǜ shang néng zhí xíng de qì yuē

在法律上能执行的契约

a legally enforceable contract