After reaching the age of majority, the new adult can date anyone, leave home against their parent's wishes, live where they want, associate with anybody they wish, pay their own bills and bail themselves out of jail.
If the parents wish, they can report it to the police if someone interferes with their control. Until then they are a minor child, and their parents pretty much control their entire life, including whom they date - regardless of the "age of consent". Exceptions are Alabama & Nebraska (19), and District of Columbia & Mississippi (21).