Each house has a kitchen garden where fresh vegetables, fruit, and herbs are raised. Traditionally, the Kui only married within their own people group. However, now they often intermarry with the neighboring Khmer . Arranged marriages are still customary, although a young man may initiate the marriage proposal by asking his parents to send a mediator to negotiate with the girl's parents. If the proposal is accepted, the groom's family gives a gift to the bride's parents to help with wedding expenses.
Newlyweds sometimes live with the bride's family after marriage.
Virtually all of the Kui practice ethnic religions such as animism . They believe in a spiritual realm that contains both good and evil spirits. Some spirits are associated with natural objects such as trees and fields, while others represent deceased parents and grandparents. It is believed that some spirits cause illness, while others bring healing and prosperity. The people must deal with sorcerers who can cause illness or death.