Ter Haar and Lendering is a family genealogy website documenting research into the creator’s ancestors on both the paternal and maternal sides. Its family tree brings together four principal branches: ter Haar and Smits on the father’s side, and Lendering and Slakhorst on the mother’s side. The site traces the ter Haar family to a part of Twente around Almelo, Weerselo and Delden, and the Lendering family to Gelderland’s Liemers region, including areas near Wehl, Bergh and Groessen.

It presents family trees, ancestral charts, surname histories, a registered ter Haar family crest, historical documents, photographs, videos, personal stories and statistics. Visitors can search for individuals and families, explore source materials and browse accounts of family history, including research into German roots and family legends. The genealogy is an ongoing project, with information periodically added and corrected, and the site welcomes relevant contributions, questions and comments.

It also invites people who find personal or family information they do not wish published to contact the researcher so the records can be discussed and adjusted