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New text report which lists double first cousins of the database. Double first cousins occur when two siblings of family A marry two siblings of family B. Their children are double cousins to each other and share the same four grandparents.
The code checks for persons with known parents and grandparents, then checks for each combination if the two people have different parents but the same four grandparents.
More discussion about finding double cousins in a Gramps database.