The present disclosure provides methods of estimating a degree of ancestral relatedness between individuals. In an aspect, a method comprises receiving haplotype data comprising genetic markers shared among a population of individuals; dividing the haplotype data into segments based on the genetic markers; for each of the population of test individuals: (i) based on the genetic markers, matching segments of the haplotype data that are identical-by-descent between two individuals, (ii) for each of the matched segments: dividing the matched segment into discrete genomic intervals, scoring each of the discrete genomic intervals based on a degree of matching within or between the individuals, correcting the scores for consistency, and (iii) calculating a weighted sum over the discrete genomic intervals of the matched segment, based on the corrected scores and assigned weights; and (d) estimating the degree of ancestral relatedness between the individuals based on the weighted sums of the matched segments.