Hello My father has a segment on chromosome 2 that is 17.09 cM total SNP 5500 start position 47680185 end position 67921093 which matches person X. The common ancestor couple has been identified. My father descends from one of the couples sons, person X descends from another son. My father and person X are third cousins. My father and I both match person Y on a segment that is within the above segment. cM 9.17, total SNPs 3500. Start position 49442161 end position 6179229. Person X and person Y are not in common. My assumption here is that the shorter segment is part of the other half of the pair of chromosomes. Can I make any other hypothesizes? Such as who this segment may belong to? Or does recombination make this impossible? Thank you, Ann G.