#12 He is his Father's brother's Nephew. So his Father's Brother's Nephew's Cousin is his cousin, which is his Father's Brother's Son. So, His Uncle's Brother's Nephew's ex-roommate is the same as his Grandfather's, on his dad's mother's side, Daughter-in-Law's Brother's Son...
#12 He is his Father's brother's Nephew. So his Father's Brother's Nephew's Cousin is his cousin, which is his Father's Brother's Son. So, His Uncle's Brother's Nephew's ex-roommate is the same as his Grandfather's, on his dad's mother's side, Daughter-in-Law's Brother's Son...