Quakers are/were expected to marry their own. Of course, my Quaker ancestors just couldn't seem to get the hang of the concept.
John Rogers married Maria Magdelene Rinker Allemong in 1787. He was a Welsh Quaker, she a Swiss Lutheran. The family eventually became Methodists.
James Prall married Quaker Deborah Whitson, who was excommunicated. Deborah's parents were condemned for allowing their daughter to marry contrary to discipline. They presented a paper at meeting condemning their own actions.
Elizabeth Prence, daughter of anti-Quaker Plymouth governor Thomas Prence, married Quaker Arthur Howland Jr. In a twist, Elizabeth became a Quaker. Papa was not a happy camper!