Which Section of the Hindu Marriage Act, 1955 defines 'Sapinda Relationship'?

Section 3(f) of the Hindu Marriage Act, 1955 defines "sapinda relationship": with reference to any person it extends as far as the third generation (inclusive) in the line of ascent through the mother and the fifth (inclusive) through the father. Under s. 5(v), a marriage between sapindas is barred unless a custom governing both parties permits it. Section 3(g) defines the degrees of prohibited relationship, a separate concept.