How much allowance should mum expecting from husband

Me and my wife is about to divorce and part of the cause was money issue. So guys help me up how much should I give? Wife and kids stay in my law house with in law care (4yo, 6mo) and I not staying with them using mil electric or water bill. I didnt study hard so my salary won’t be flying high. I 1 day already work 18hr full time and part time. Full time 2.9k before cpf Part time 800 fix I give my wife $500 w $2k limit CC House coming so force myself put 1k for saving How much balance I left ? Weekend outing bill mostly under me. Baby milk powder and diaper most my dad sometime me and my wife So how much should I really need to give my wife and mil? I guess my wife also pressure by mil about money issue.