#family_id	sample_id	paternal_id	maternal_id	sex	phenotype	ethnicity
family1	HG004_NA24143_mother	-9	-9	2	1	CEU
family1	HG003_NA24149_father	-9	-9	1	1	CEU
family1	HG002_NA24385_son	HG003_NA24149_father	HG004_NA24143_mother	1	2	CEU