The graphic familytree or other versions, such as the topola tree, for Grietje Rozema (Rozema-158) has a same pair of ancestors (Geertsema-47 and Van_Til-54) for both her father and her mother, which is unusual,but correct in this case. This pair of ancestors is, however, shown separately for her father and separately for her mother, so that the pair appears twice in the graph. This seems strange and not correct. One should expect the pair to appear once only. Am I missing something?