Following marriage, a couple begins a new family and establishes a shared residence, whether as a separate family unit or as part of an already established family group. The social rules that determine where a newly married couple will reside are called postmarital residence rules and are directly related to the descent rules that operate in the society. These rules may be adapted due to extenuating circumstances such as economic need or lack of housing. In the United States today, for example, it is increasingly common for newly married couples to postpone the establishment of a separate household when work, schooling, or children create a need for familial support. There are five postmarital residence patterns: Under neolocal residence, a newly married couple establishes an independent household not connected to either spouse’s family. This pattern of residence is mostly associated with bilateral descent. While this is a norm in our own society, during times of economic stress or familial need, couples in the United States do occasionally live in the household of one spouse’s parents. More common worldwide is patrilocal residence, associated with societies practicing patrilineal descent. In patrilocal residence, the newly married couple establishes their new household with or near the groom’s father or the groom’s father’s relatives. What this means is that at marriage the groom remains within his household and/or family group, while the bride leaves her parents. Their future children will belong to the groom’s lineage. Matrilocal residence is associated with societies practicing matrilineal descent. In matrilocal residence, the newly married couple establishes their new household with or near the bride’s mother or the bride’s mother’s relatives. At marriage the bride remains within her household and/or family group, while the groom leaves his parents. Their future children will belong to the bride’s lineage. Less frequent but also associated with matrilineal descent is avunculocal residence, in which the newly married couple resides with or near the groom’s mother’s brother. In societies that practice avunculocal residence, the groom has commonly had a long-term relationship with his maternal uncle, who is part of his own mother’s matriline. By joining with household of the groom’s maternal uncle, the couple is able to benefit from both the husband’s and the wife’s matrilines. Under ambilocal residence, the couple decides which spouse’s family to live with or near. Ambilocal residence is associated with ambilineal descent. In ambilocal residence, the newly married couple will usually have made their decision about which spouse’s family to join with prior to their marriage. Their future children will then trace descent through that particular line.