I don't think you can save money....
留低BB比99湊 比番3千佢 for 湊BB...
Then, how much 家用 will you give for 99 and 62 (as they are your husband's parent!)?
If you won't pay your 62 and 99家用, then, you need to pay the market price for 留低BB比99湊,放假先自己湊番BB => It is around 5k per month.
如果你淨係比3千99, 但要湊埋你 BB, 就真係有 D 過份喇,一齊住, 比左 6千, 仲有人煮埋飯湊埋仔都好應該係呢個數啦. 搬出去住唔係咁簡單架, 一闊三大. 如果同 6299 D 關係唔係咁差, 忍下先啦,到阿 B 大D, 99淨係湊返學放學會好 D. 同埋而家 D 租金好貴呀 ! 慳番 D 錢先旁下身或者留比阿 B 用.