Employment, other than employment under a written contract of service or apprenticeship, by the father, mother, grandfather, grandmother, stepfather, stepmother, son, daughter, grandson, granddaughter, stepson, stepdaughter, brother, sister, half-brother or half-sister of the employed person (other than in a case where any such relative is a ward of court within the meaning of Order 67 of the Rules of the Superior Courts (S.I. No. 15 of 1986)), where the employed person is a member of the employer's household and the employment is related to a private dwelling house or a farm in or on which both the employer and the employed person reside, is hereby specified as employment for the purposes of paragraph 3 of Part II of the First Schedule to the Principal Act.