Hello Ashley
The source you link to above, gives the deaths of Reginald and Eleanor as circa 1306 and circa 1308 respectively, and Rose Verdun/Hussey's father died in 1309, so I think Reginald and Eleanor are more likely to be her parents-in-law, rather than her son and daughter-in-law.
Unfortunately most of the existing profiles for members of the Husee/Hussey family are very poorly sourced, if they are sourced at all, which does make it difficult to make any sort of valid judgement about where they all fit.