Start of relationship is irrelevant. They have to have gotten MARRIED before you turned 18 in order for you to be able to petition for your stepfather. If they did not, you can petition for your mother and then your mother can petition for your stepfather as her husband. Please let me know if you have any additional questions or how I can be of further assistance to you in this matter.
Answered on Jun 11th, 2013 at 10:05 PM