D is brother of K. M is sister of K. T is father of R who is brother of M. F is mother of K. At least how many sons does T and F have?
D is brother of K. M is sister of K. Also, R is brother of M.
=> D(male), M(female), R(male) and K are siblings.
F is mother of K and T is father of R
=> T is husband of F.
We do not know the gender of K, hence T and F can either have 2 or 3 sons.
=> Ans - (D)
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