Thanks, I appreciate the answers, so far. To clarify, I was not considering consanguinity directly in this case.
Heywood,
I'm afraid my info is very sketchy. Essentially, it boils down to this:
A woman remarried later in life. I'm guessing she must have then been roughly about fifty.
The church record of her first marriage does not survive, and it was before civil records. There doesn't seem to be a civil record for her second marriage that I can find. The church record of her second marriage record - only an index on IrishGenealogy - no primary source available for the parish at
https://registers.nli.ie/ - gives her parents' names. Here's a summary of it:
Marriage of DANIEL CLIFFORD of TINIHALLY and CATHERINE DONOGHUE of W TULLIG E on 29 November 1890
Parents of Catherine: John Brennan and Honora Sweeny
Parents of Daniel: John and Ellen Clifford
Witnesses: Patrick Reilly and Johanna Dodd
(Killorglin Parish, Co. Kerry)
I have no other strong direct indication of the names of her parents, other than this record. But it doesn't seem to be reliable. The father's last name is slightly off - Brennan compared to the true maiden name Breen. (though I am 100% sure it is the same woman, based on strong evidence) And I could easily believe that the father's name was misinterpreted, as elsewhere, I have seen Breen written so it could be misinterpreted as Brennan.
But the mother's name really throws me for a loop. There is no couple like that in the surviving records, either with Breen or Brennan. And I can guess the rough timeline when the daughter (the bride who remarried) was born with reasonable certainty. Not the exact year, but within about +- 3 three years. Enough to know that her birth should probably appear in the surviving record, even if it was in a nearby parish. Or, even if the page was damaged, I think a sibling would probably still appear.
One possibility that I was considering is that the mother listed in the record was really her stepmother. If so, then there is a strong possibility that her father remarried during a gap in the records. There is about a 22 year gap, or larger.
Unfortunately, though the woman (again the bride who remarried, age about 50) had many children, only two baptism records survive, so not a lot of clues in the sponsors names, to connect her to her parents, other than this marriage record. Though, I have some very weak evidence, which allowed me to suspect two different couples, both living in the same townland. In one case, the father's name was John Breen, but in neither case was the mother's name close.
In one surviving baptism record, the name Sugrue appeared. This was the maiden name of both of the two mothers that I was considering. A witness to the marriage of one of her sons was also named Sugrue, though it is a common name. The other surviving baptism record had a couple as sponsors who lived in the same townland as both these couples