I bloke I worked with did this all wrong.
He had two daughters who for a while worked at the same place. They would be forever popping in for money, and he was always a pushover. Then one of them got pregnant and her boyfriend moved in. Her room could not fit a double bed, so the boyfriend slept on the sofa. If they woke up in the middle of the night, he could not go down to the living room, and often could not go in there on a morning either if the boyfriend was sleeping in.
Then as he retired, the baby was born, so his daughter went back to work and he became the full time nanny.
65 years old, a good career and the end result was living in a house with a baby, not being able to use your own living room and spending all your retirement 'freedom' doing baby care (which is the hardest work). The daughter would often go out or away for weekends and not even ask, just hand him the child, pick up a bag and be off.
I think I'd rather keep working, and be telling the boyfriend to fuck off or find somewhere for the three of them to live.