Four of the following five are alike in a certain way based on the given arrangement and so form a group. Which is the one that does not belong to that group ?

F, the wife of D is sitting third to right of C, => D is male and F is female.

A is the son of H. A is sitting second to left of D. D is not an immediate neighbour of either F or C, => D sits second to the left of C and A (male) sits to the immediate right of F. 

No male is an immediate neighbour of D and G sits second to left of D's son, => D's son sits to the immediate right of C and G sits to the immediate right of D, and hence is a female.

Only two persons sit between H and A's brother and neither C nor D is the brother of A, => H sits to the immediate left of D (hence is a female) and A's brother, i.e. E sits to the immediate left of F.

D's son and the wife of D's son are immediate neighbours of each other, => B is D's son and C is his wife.

Also, G is the sister of E (given).

Apart from B, all are females.

=> Ans - (A)