He had a relationship with N.N..
Child(ren):
{geni:about_me} Siegfried II of Walbeck might have been married to https://www.geni.com/people/Guda-Kunegonda-van-Stade-van-Valkenburg/6000000043208678192 and he might have been the father-in-law of https://www.geni.com/people/Arnold-I-heer-van-Rode/6000000003827924143. For argumentation, see the profile of Arnold I of Rode's [https://www.geni.com/people/N-N/6000000025845894037 first wife]
The data shown has no sources.