#family_id sample_id paternal_id maternal_id sex phenotype 1 1_dad 0 0 -1 1 1 1_mom 0 0 -1 1 1 1_kid 1_dad 1_mom -1 2 2 2_dad 0 0 -1 1 2 2_mom 0 0 -1 1 2 2_kid 2_dad 2_mom -1 2 3 3_dad 0 0 -1 1 3 3_mom 0 0 -1 1 3 3_kid 3_dad 3_mom -1 2