The Council Tax (Exempt Dwellings and Discount Disregards) (Amendment) Order 1998
For the purposes of class W :
a dwelling which forms part of a single property including at least one other dwelling and which is the sole or main residence of a dependant relative of a person who is a resident in that other dwelling or as the case may be one of those other dwellings;
For the purpose a dependant relative is:
aged 65 or more or
severely mentally impaired or
substantially and permanently disabled whether by injury illness or congenital deformity or otherwise
Relative to be defined as :
if he is the spouse/civil partner of that person
he is the persons parent, child, grandparent, grandchild, brother sister, uncle or aunt, great grandparent, great grandchild, great uncle, great aunt, great nephew or great niece or
he is that persons great great grandparent, great great grandchild, great great uncle, great great aunt, great great nephew or great great niece and
i) relationship by marriage shall be treated as a relationship by blood
ii) relationship between a man & woman living together as husband and wife shall be treated as a relationship by marriage and
iii) the stepchild of a person shall be treated as his child
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