Not necessarily. While many insurance plans can cover the children of the policyholder, additional coverage is sometimes necessary. Families should look over their insurance policies to determine whether their young adult might need something more. Young adults may only be covered under certain circumstances, like if they reside with the policyholder or are under a certain age. It's also important to consider that the risks young adults may face can depend on their life stage, and that they may need different coverages as they get older.