Is there a way to cancel or revoke my sponsorship of my son-in-law who has moved back to his home country (as of Sept. 20, 2014) and had lived in the U.S. since July of 2013? He is currently married to my daughter, and had been refusing treatment for mental illness. After many attempts to convince him to take his medications and follow his treatment plan failed, he decided to go back home to Kenya. Me, as his "sponsor," would like to start the process of cancelling sponsorship and have been having a hard time finding information on the USCIS website. Any help here would be extremely appreciated!! What do I need to do? Thanks in advance for any help with this matter!!