Section 2(28)(a) in The West Bengal Co-Operative Societies Act, 1983
(a)"joint member" shall mean any one of two persons admitted jointly to the membership of a co-operative society under sub-section (4) of section 69, and shall include either of the following persons so admitted:-(i)husband and wife,(ii)father and son or unmarried daughter, and(iii)mother and son or unmarried daughter;