My son Turned 18 in November. He decided he wanted to go live with his Mother because I Grounded him for having bad grades his Senior year of High School. I am rather Strict on Grades but when he is a Senior and Failing, I feel like it is my responsibility as a Parent to get him Graduated. Anyway, We also have a 13 Year old Daughter that I have custody of. The Mother had her Attorney Contact my Attorney and request a Modification for the 13 year old to live with her Because the Children to to be in the same home. 1) When a Child turn 18 he becomes and Adult, It was his Choice to move out and I dont think this has anything to do with the 13 year old. 2) Him turning 18 and Moving was part of the Plan from Birth, IF he is 21, Married with Children, Would she still want them to be together? 3) I dont think him Turning 18 is a Material Change in Circumstance for a Change in Custody. Whats your thoughts?