FAMILY_ID SUBJECT_ID FATHER MOTHER SEX MZ_TWIN_ID 100 1001 0 0 2 100 1002 0 0 1 100 1 1002 1001 1 1 100 2 1002 1001 1 1 101 1011 0 0 2 101 1012 0 0 1 101 3 1012 1011 1 102 1022 0 0 2 102 1023 0 0 1 102 4 1023 1022 2 103 1032 0 0 2 103 1034 0 0 1 103 5 1034 1032 2 104 1043 0 0 2 104 1044 0 0 1 104 6 1044 1043 UNK 105 1053 0 0 2 105 1054 0 0 1 105 7 1054 1053 UNK 106 1055 0 0 2 106 1056 0 0 1 106 8 1056 1055 1 2 106 9 1056 1055 1 2 106 10 1056 1055 2