There are many types of relationships in Numenera.
In most of these, people are encouraged to choose their partners freely. Couples co-own resources, businesses, or whatever is in their possession. If they choose to split, they work out the division of property by themselves or with the assistance of amediator. Arranged marriages or the like can happen, but usually only on the two ends of the class spectrum—among the nobility and among slaves.
Couples of all genders, sizes, and sexual orientations are common. Two-partner heterosexual relationships are in the majority, but they aren’t the norm, per se. Many people choose to participate in commitment ceremonies. Occasionally, a larger group of adults make commitments to one another, living together and raising children as a communal family.
Not everyone in a relationship makes a formal commitment to each other, but those who do have a number of choices. Ceremonies can be private or public and take the form of handfasting, feasting, exchanging goods and services, or holding a large, elegant gathering in the presence of an officiant. In most cases, living together for longer than a year is considered the same as having a commitment ceremony.