I am currently 22 years old and was born in the U.S. My parents have not left the U.S. in over 15 years and I would like to make my parents U.S. residents since I was told children over 21 years old are eligible to start this process. My parents are also not married, so I know that the process will be conducted seperately. I would like to know what are the procedures needed to make my parents legally able to live here without leaving the country. Also, how long will this process take? Is a lawyer needed or can I complete the forms by myself? Thank you.