Thanks for posting. In my case, I have a marriage in Anglican church, no parents' names listed for either party. However, their first son born a year or so later was baptized RC. His godmother's name matches a POSSIBLE paternal grandmother. If it is at least plausible that a paternal grandmother would stand as godmother for a grandson, then I am taking this as a good clue for constructing a possible tree. There are other clues and info that would fit the scenario.