Co-wives are often sisters (see sororal polygyny). Jane Percy, Duchess of Northumberland, is Woosnam's sororal grandniece. The Urarina customarily practice brideservice, uxorilocal patterns of post-nuptial residence, and sororal polygyny. Cripps was the sororal nephew of Beatrice Webb and Catherine Courtney. A political meeting, the Compromise of Caspe, found in favour of Martin's sororal nephew Ferdinand.