Coswarth Pedigree Cornwall

Question

Catherine Coswarth-1, John Coswarth, Edward Coswarth-4

How are they all related?

On geni it says that Catherine and Edward were siblings, but that can't be right, Edward married Dorothy Arundell, daughter of his sister?

Would be great to get this sorted out.

Comments

For Catherine, look for father Nicholas Cosworth, son of Robert and Mary Wolveden

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Thanks Eddie, will see what I can find. Regards. Zoe

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https://books.google.com.au/books?id=MhsiAQAAIAAJ&pg=PA416&lpg=PA416&dq=nicholas+coswarth+pedigree&source=bl&ots=BuWvwUCMi5&sig=EA-0d_rezhXwVEIBeOe3VgtOldE&hl=en&sa=X&ved=0ahUKEwj9yKrnu43TAhXillQKHR9bDNcQ6AEIHzAC#v=onepage&q=nicholas%20coswarth%20pedigree&f=false

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The wording is often confusing so maybe the Pedigree records have got it wrong.  It would make more sense that her father was Nicholas Coswarth who was the older son who died young and his brother inherited.