W. Va. Code § 49-1-205

When used in this chapter, terms defined in this section have the meanings ascribed to them that relate to, but are not limited to, developmental disabilities, except in those instances where a different meaning is provided or the context in which the word is used clearly indicates that a different meaning is intended.

“Developmental disability” means a severe, chronic disability of a person which:

(A) Is attributable to a mental or physical impairment or a combination of mental and physical impairments;

(B) Is manifested before the person attains age twenty-two;

(C) Results in substantial functional limitations in three or more of the following areas of major life activity:

(i) Self-care;

(ii) Receptive and expressive language;

(iii) Learning;

(iv) Mobility;

(v) Self-direction;

(vi) Capacity for independent living; and

(vii) Economic self-sufficiency; and

(D) Reflects the person's need for services and supports which are of lifelong or extended duration and are individually planned and coordinated.

(E) The term “developmental disability”, when applied to infants and young children, means individuals from birth to age five, inclusive, who have substantial developmental delays or specific congenital or acquired conditions with a high probability of resulting in developmental disabilities if services are not provided.

“Family or primary caregiver,” for the purposes of part six, article two of this chapter, means the person or persons with whom the developmentally disabled person resides and who is primarily responsible for the physical care, education, health and nurturing of the disabled person pursuant to the provisions of part six, article two of this chapter. The term does not include hospitals, nursing homes, personal care homes or any other similar institution.

“Legal guardian,” for the purposes of part six of article two of this chapter, means the person who is appointed legal guardian of a developmentally disabled person and who is responsible for the physical and financial aspects of caring for that person, regardless of whether the disabled person resides with his or her legal guardian or another family member.