A number of historical records imply that the family group which he and Wicbert seem to be a part of were related to the Ottonian dysnasty, Robert, Archbishop of Trier, and possibly the House of Reginar.
The record which has survived says that one of the early possessions of the Abbey was half of the church at a place called Wiettine or Biettine in the Maasland district.
Aubert Miraeus published the early modern version of this text which appears to have clarified, and maybe modified, the meaning, so that Ansfried is definitely the son of Lambert, not Wicbert.
Count Lambert I of Louvain and his brother Reginar IV were exiled around 958 and began attempting to return to Lotharingia in 973 claiming some of the places their family had once held.
More recently Jongbloed (2009) has controversially proposed that Ansfried can confidently be described as the son of Wicbert, though authors such as Karsten and Aarts think that the reading of Miraeus might still be justifiable if the text of the Gesta itself already contained an error.
In his influential work of 1902, Vanderkindere made a proposal that Lambert married an unattested daughter of Ricfried, Count of Betuwe, and they were the parents of the younger Ansfried, the witness (who was however too young to be advocatus), who would later become Bishop of Utrecht.