It just occurred to me: does Sou's mom have a job? She seems to have an awful lot of free time to cosplay and such...
She does leave for work in chapter 36, just looks like a typical japanese salarywoman. She definitely only works part-time as a mother of 3 (one of them male) in this economy/society. Honestly with the subsidies being a thing it makes me wonder why she works at all, but perhaps a steady employment is one of the conditions to meet, lest too many women take advantage of the "free" money just for pumping out babies.Previous chapters mentions gov subsidies for children and extra subsidy for having a male.