Support for Dependent Adult Children; Specifying that parents are responsible for supporting a dependent adult child; requiring certain rights of the parents of a dependent adult child to be established in a guardianship proceeding; prohibiting any person who is not appointed by the court from managing assets for or making certain decisions for a dependent adult child; specifying that a child support order need not terminate on the child’s 18th birthday in certain circumstances; authorizing a court to assign support to certain trusts established for a dependent adult child for a specified purpose; authorizing guardians of dependent adults to petition the court for certain support payments from the dependent adult’s parents in certain circumstances, etc.