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