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Wikidata user HRvO was very helpful in explaining the current state of understanding - that Robert I of Nassau is the Grandfather of Walram I - through a son Robert II. He very kindly wrote as follows:
- Of course I want to help. I understand the frustation when the data in databases is incorrect or inconclusive.
- From the charters referred to in the Dutch sources it is certain that Rupert I was married to Beatrix of Limburg. From another charter is is certain that from the marriage they had a son called Arnold II. From other charters it is known that Arnold II ruled Laurenburg together with his brother Rupert II. This in the past caused diffussion as Rupert I also ruled together with his brother, who was also called Arnold.
- From a charter from 1158 it appears that Beatrix of Limburg was regent for her grandchildren. Her sons Arnold and Robert are also mentioned in that charter.
- Then there is a gap in prove for the exact family relations. Three counts, then calling themselves "of Nassau", appear after 1160: Rupert III, Henry I and Walram I. The remaining charters name Rupert III and Henry I as cousins, and also name Rupert III and Walram I as cousins. From this the German scolar Hermann Heck concluded that it is likely that Henry I and Walram I were brothers. This conclusion is shared by the Dutch sources I mentioned above.
- It is correct that Cawley mentions a Beatrix as the mother of Walram I, quoting a manuscript dated to end 13th/early 14th century. According to H.F.J. Hesselfelt in his article this is probably an error and did the name Beatrix refer to Walram's grandmother Beatrix of Limburg. Note that Cawley quotes the same dates of death for both the wife of Rupert I and Rupert II. It's unclear what the name of the wife of Rupert II was, it might be that she was also called Beatrix, which would be a coincidence. But in the Dutch sources she is simply called "unknown".
- So yes, I would suggest you would name Rupert II as child of Rupert I and Beatrix, and Walram I as child of Rupert II and an unknown woman. I hope this explanation did help
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