A method and system are presented for merging a first family tree to a second family tree. The method comprises: providing a plurality of first matrices associated with the first family tree and a plurality of second matrices associated with the second family tree, each matrix comprising attributes on individuals that are linked to one another by a predetermined link; identifying substantially identical first and second matrices in said pluralities of first and second matrices; and generating data indicative of a merge of the family trees to one another if a number of the substantially identical matrices exceeds a predefined number.