The Law of Moses was given as a preparation for the coming of Messiah, which we know now is Jesus Christ. The Law was given to show their sin and their need of a Savior.
Moses did not have a "stepfather-in-law" since his wife, Zipporah, never had a stepfather. Moses' father-in-law was Jethro.
No they were not given to Moses.
Moses father in law Jethro lived in Midian , he was a priest.
Moses was in Egypt, his wife and children might have been there or with Moses' father in law.
Generally attributed to Moses. It was Jehovah who gave it.
Moses
The Ark
his brother in law.
5 books of the law of moses
she had leprosy
the law was given to Moses
Jethro took Moses in as a guest when Moses had to flee Egypt. He gave his daughter Zipporah to Moses in marriage (Exodus ch.2). Later, Jethro brought Moses' family to him in the wilderness (Exodus ch.18). At that time, he suggested to Moses the idea of appointing judges/officers for the Israelites (ibid).