I don't remember well but a Chinese novel where a girl gets transmigrated? into the 50's-60's or back in time and she has three useless siblings two brother ,one sister and a sister-in-law her parents are dead and she has good handwriting so she gets promoted and they move to a neighborhood recommended by someone she works with. Plz don't tell me this was a fever dream and there's no novel like that . She ends up in the hospital and wants to control all the money in the family her in-laws come over to fight. The first house was in a commun? Of sorts for low income people
https://www.novelupdates.com/series/the-green-teas-crushing-victories-in-the-70s/ Maybe? No sister in law though, if not mistaken.