The CRE uses the term racial group, in the context of racial discrimination cases with the definition given in the Race relations Act 1976 that is, to cover groups defined by common race, colour, ethnic origin, national origin, or nationality (including citizenship). Please note that it is a matter of rulings by the courts - not of CRE house style - that certain groups have the status of racial groups under the Race Relations Act while others have not for example, that Sikhs, Jews and Irish Travellers qualify, but Muslims and Rastafarians do not.

an extended family that has inbred to some extent

an extended family that is

a partly inbred extended biological family

a totality and all the people belonging to it bear the characteristic features that are inherent in the nature of the group

This refers to a group of people who share common characteristics which identify them with one another, and that distinguishes them from other groups. They usually have a common language, institutions, values and traditions.

A group with common biological heritage, usually one that makes them visibly distinctive from others in their milieu. If there is a shared sense of membership and identity, then racial groups are merely categories created by others on the basis of superficial physical characteristics.

A group of people defined by race, colour, nationality and ethnic or national origins. All racial groups are protected from unlawful racial discrimination.