Relationships can be very complicated. Trying to visualise this family tree from Corby would give anyone a headache!
“An extraordinary relationship of two families living at Corby, Northamptonshire, – The master and mistress of one family are both father and mother, and brother and sister, to the master and mistress of the other family; consequently both grandfather and grandmother, and uncle and aunt, to their children: While the master and mistress of the second family are both brother and sister, and son and daughter, to the master and mistress of the first; also uncle and aunt, and cousins, at the same time, to their children. – The mistress of the second family is sister to her own father, and aunt to her own brothers and sisters.”
Stamford Mercury, 7th December, 1798.