Socially defined expectations that individuals in a given situation are expected to fulfil, are called:

Roles

Roles are socially defined expectations that individuals in a given situation are expected to fulfil. Roles refer to the typical behaviour that depicts a person in a given social context. You have the role of a son or a daughter and with this role, there are certain role expectations, i.e. including the behaviour expected of someone in a particular role. As a daughter or a son, you are expected to respect elders, listen to them, and be responsible towards your studies