PersonA,PersonB,AIsToB,BIsToA,StartDate,EndDate
GAN200011,GAN200012,Parent,Child,2015-08-12,
GAN200015,GAN200014,Sibling,Sibling,2015-08-12,2015-09-13
GAN200011,Super Man,Patient,Doctor,,
GAN200015,NonExistingPatient,Patient,Doctor,,
GAN666666,GAN200012,Sibling,Sibling,,
GAN200015,Super Man,Patient,Doctor,2015-08-12,2015-09-13