canadianbeth
LostCousins Star
If the Elizabeth Joyce and her father James Joyce are not those in your tree, then this hint may well be a case of mistaken identity. Joyce is not an uncommon surname and the hint is not telling you that John Francis Attwood and Gertrude Webster are related to you, it is simply raising the possibility for you to investigate further.
I would put this FamilySearch hint to one side for now and focus instead on the Websters in your DNA matches to see if they might lead you to your unknown grandfather. You do at least know these 'DNA Websters' are related to you somehow.
I will be checking out the DNA Arthur's siblings to see if one of them could be the culprit.