If the military wasn't being invaded by woke faggatronic ideals right now and someone had a soft and weak willed kid I'd say tell them you can be homeless or you can join the military. At least there they get toughed up, experience things most people don't, have to learn how to be responsible and they make some money doing it.
As long as they are doing well in school. When they graduate they are going to college for something is obtainable for the child and will actually be a benefit to them (getting a degree in diversity management or underwater lesbian folk dance is not), they help out at home doing chores, have at least a part time job and working towards being independent then they can stay for a while. But not forever.
But if the kid is a blue haired pronouns lazy ass cry baby with no ambition to be independent and does little to help and show appreciation I'd only tolerate that for a few years. But if you're 21 and still a useless tit then out on your ass you go. It wouldn't be easy to do that to your child but at some point they need to learn lessons the hard way if they can any other way.
But I'd like to think I'd raise my child to be strong, smart, independent and responsible so when they time came they were ready to go out and attack life so to speak and be able to take care of themselves. But that has to start when they are young.
My grandma loved me as much as anyone can love someone and she never took it easy on me but at age 8 I'd go off in the woods for a day or two alone, when I was 12 I drove a car to school, I worked when I was 14 and made some money, I always helped do chores and was appreciative. She made me tough.