Can I Put My Sister On My Health Insurance? 
In most instances the answer is no . Exceptions can be that your sister is a Minor Child and you have Custodial Responsibility for her . This must be verified by your insurance company in the form of a court document granting those responsibilities to you or guardianship . Another instance is if your sister is an adult 18-25 and she is handicapped or has diminished capacity and a court has appointed you as guardian . Then they can be added as you would a child with your insurance company under the insurance company plan rules you have . In most cases as an adult , we must look to get insurance under our own plans whether through a group plan at work or individual plan or through your State Insurance Exchange . 