IndividualId	FamilyId	Gender	Mother	Father
m100	dt_001	m	.	.
m101	dt_001	f	.	.
m102	dt_001	f	m101	m100
m103	dt_001	m	m101	m100
m104	dt_001	f	m101	m100
m105	dt_001	f	m104	m202
m200	dt_001	m	.	.
m201	dt_001	f	.	.
m202	dt_001	m	m201	m200
m203	dt_001	m	m201	m200