In the following problem, there is one question and three statements I, II and III given below the question. You have to decide whether the data given in the statements is sufficient to answer the question. Read all the statements carefully and find which of the statements is/are sufficient to answer the given question.

How is the man in the portrait related to Jignesh?

I. Pointing to the portrait, Jignesh said, "He is the father of my mother's only grandson".

II. Jignesh is the only child of his parents.

III. Pointing to the portrait, Jignesh said, "He is the only son-in-law of my father".