Final answer:
One reason why a particular couple might not follow their society's residence rules is due to economic need or lack of housing. Couples may need to live with their parents or family members temporarily until they are able to establish a separate household.
Step-by-step explanation:
One reason why a particular couple might not follow their society's residence rules is due to extenuating circumstances such as economic need or lack of housing. Sometimes, couples may need to live with their parents or family members temporarily until they are able to establish a separate household. For example, in the United States, 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.