Hi, we have one child (3 years old) & are currently living with my MIL (can't afford Sydney rent or mortgage but our jobs are here) (it's getting cramped in her house), she has said we can build a granny flat in her backyard for us to live in. We've been out & had a look at some Granny Flats & the living area is quite small. Are we nuts? Or is 60 square meters plenty? Wondering if anyone has done it as a family of 3? Thanks in advance.