This is similar to how my parents grew up. My mother shared a bed with all her sisters at one point, but as they got older I think they were forced to be 2 to one bed and 3 to another until the eldest married.
My dad didn't graduate highschool, he dropped out at 15 to start work and move out of his home (because they had more problems than a lack of money), literally at the first chance he got. He worked around to become a mechanic and eventually opened his own shop. He got into fuel injector programming, which got him a job at Ford, which when me and my brother were little meant we had 3 meals a day (literally sometimes 4), got almost everything we wanted but already had everything we needed. We had family vacations to places even my friends didn't get to go to.
I think what he taught me most was to not give up and just keep trying. He said he had over a dozen jobs in a half-dozen years while paying his way to get qualified as a mechanic. He's had 3 companies, all successful in their time before he moved on to bigger and better to get solidly middle-class from not even a working class upbringing.