for public transport I 1 person every month spend $200 liao, 2 people should be $400. And with a baby/child, u'll need to take more taxi
u said your benchmark is 1k, so 2 people 2k?
Daily needs 1.5k
Baby+Parents to care $2k
even if they ultra-save, a couple will have below 1k to save, no need to retire liao