The 1st Baronet is listed with a daughter Catherine on p.628 of [Debrett's Baronetage, 1828].
This is in the time of the 2nd Baronet. He cannot be paying much attention to Debrett's if he allowed it to list him with the wrong sister.
In the entry, the 1st Baronet's daughter Catherine marries Rev. Edward Conyers, of "Knockman".
Catherine Blennerhassett, born 1788, daughter of "Sir R. Blennerhassett".
From Limerick City Library extracts from the book Records of Ballingarry [Hamilton, 1930].
If she really was born 1788, this would be a dau of the 1st Baronet, not the 2nd Baronet (who married 1790).
When we look at the original source in [Hamilton, 1930] though, we see the extract is misleading.
The extract makes it look like it is an original baptism entry. But it is not. It is just an extract from a set of family notes in the book. In the original notes, Catherine is discussed as the person who married Rev. Edward Conyers and was born 1788 and died 1869. This context is lost when making the extract of BMD.
So there is no new Catherine. The date 1788 is simply an error.
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