2 sentences for 家用 (jiā​yòng — housekeeping money)

1. 他利用业余时间做兼职来补贴家用。

   tā lì​yòng yè​yú shí​jiān zuò jiān​zhí lái bǔ​tiē jiā​yòng.

   He uses his spare time to work part-time to supplement the family income.

   Source: Dong Chinese Dictionary

2. 他每个月都会留出一部分工资作为家用。

   tā měi gè yuè dōu huì liú​chū yī bù​fen gōng​zī zuò​wéi jiā​yòng.

   He sets aside a portion of his salary every month for household expenses.

   Source: Dong Chinese Dictionary