You can apply for the concession for up to 2 FDWs
(for 2 eligible persons in the household).

http://www.mom.gov.sg/passes-and-permits/work-permit-for-foreign-domestic-worker/foreign-domestic-worker-levy/levy-concession

如果有两个娃，或者一娃一老人（必须是新加坡人），就可以申请2个折扣。

不然的话，第二个应该是会贵的吧。