Honouring Parents-In-Law

(24) ...A person is obligated to honour his father-in-law. Rema: There are some that say, that a person is not obligated to honour his grandfather, but this does not appear correct to me. Rather he is obligated in the honouring of his father more than that of his grandfather (and we can see that from the midrash on Gen 46:1 - Jacob offers sacrifices to the God of his father Issac - not Abraham).

(7) (Exodus 18:7) "And Moses went out to his father-in-law": They said: There went out (also) Aaron, Nadav, and Avihu and seventy of the elders of Israel, followed by all of Israel. Other say: Even the Shechinah went out with them.

(8) "and he bowed down to him and he kissed him": I would not know who bowed down to whom or who kissed whom, were it not written (Ibid.) "And they greeted, a man, his neighbor, in peace." Who is called "a man"? Moses, as it is written (Numbers 12:3) "And the man, Moses, was exceedingly humble." It was Moses, then, who bowed down to his father-in-law and kissed him. From here they said that a man should be prepared for the honour his father-in-law. "and they came into the tent": the house of study.

(24) So Moses hearkened to the voice of his father-in-law, and did all that he had said. (25) And Moses chose able men out of all Israel, and made them heads over the people, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens. (26) And they judged the people at all seasons: the hard causes they brought unto Moses, but every small matter they judged themselves. (27) And Moses let his father-in-law depart; and he went his way into his own land.