John pointed to joseph and said that his father is my fathers only son

• Joseph's father is my(John) father's ONLY son
  John is the ONLY SON of his father
  so John is the father of Joseph.
  in easy language-
  
  let
  Joseph is A
  John is B
  John's father is C
  Joseph's father is F
  -> is the relation from son to his father
  then
  A->F(is only son of C)
  B->C(B is the only son for C)
  so father F=B
  A->B (Joseph is a son of John.)
  
  ANSWER: JOHN and JOSEPH has Father-Son Relationship.
  
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• John is grandfather of Joseph
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• joseph's grand father is john
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