Marriage and relationships are seen differently by in-Territory Simes than by out-Territory Gens. Individuals who grow up on one side of the border and move to the other side become bi-cultural.
(Source: Index card file. Attributed to Jean Lorrah -- April 20, 1977) Householding and Oath of Firsts: group marriage composed of all the channels and Donors --- scrupulously honoring vows of faithfulness to the group, not to an individual --- with imprintation thrown in to complicate things.
Family in Mahogany Trinrose: Mora and Imrahan married, Imrahan and Digen in orhuen. Ercy regards both men as her fathers, equally.
(Source: Index card file. Unto Zeor, Forever) Digen can perform a wedding ceremony in Zeor. Also, a civil wedding is possible. "Perfect" Distect marriage: Two men and two women transfer mates.
(Source: Index card file. First Channel) To Rimon and Kadi, this meant living together. (Formalized when they had a child.) Did have a pledge ceremony, usually with a big party.
Carlana plans to "be married" in the Fort Freedom chapel --- a simple ceremony with Abel Veritt presiding and a few friends to witness. Carlana and Del did apparently have sex before this, after they Killed in the Raid.
Fort Freedom is founded by Abel Veritt and a group of Simes who grew up out-Territory and dedicated to preserving as much of Gen culture as Simes possibly can, hence Fort Freedom's marriage customs are hybridized.