Should parents be forced to support their 18-year-old child?

An 18-year-old girl sues her parents because she refused to live by her parents rules and decided to choose her boyfriend over her parents. She asks the court to force her parents to support her and pay for her college. I agree with the judge, this is opening a can of worms. But as I have told others and have posted on Facebook before, thanks to democrats and republicans, we have been heading down this road a long time ago. As we continue to tell people that they are not old enough to make choices as to what they can and cannot put into their body until they are 21 and that they can stay on their parent's health insurance until they are 27, we are telling children that they are not adults when they are 18 and in fact, telling them that they can not be on their own. If we are going to say that people are not responsible adults until they are 21 or 27, we need to be consistent and say that it is illegal for someone under the age of 27 to live on their own and school needs to be mandatory until they are 27. For me, I think that 18 is a good age for a person to be independent. What do you think?