That thou shall have no other gods in any form, and you shall not bow to them.
moses and the mosaicc law
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.
The first five books of Moses are the book of law, they are Genesis, Exodus, Leviticus, Numbers and Deuteronomy are the books.
Moses father in law Jethro lived in Midian , he was a priest.
Jews call them the 'Torah' or the 'Law of Moses.' Many others refer the first five books of Moses as the Pentateuch.
Jethro was the father of Moses' wife (Exodus ch.2 and ch.18).See also:more about Moses
God inscribed the Law on the first pair of tablets. When Moses came back down from the mountain, though, he discovered that the people had already broken the law and were sinning greatly. In anger Moses smashed the tablets. After this God commanded Moses to return to the mountain, create two more tablets of stone, and inscribe the Law on these replacements. Presumably Moses had memorized what was on the first tablets, or God told Moses what to write.
five the books of moses
To Moses the Lord first gave the Higher Priesthood and revealed the fullness of the gospel. But Israel rebelled and manifest such gross unworthiness that their God took from them the power whereby they could have become a kingdom of priests and of kings and gave them instead a lesser law, a preparatory gospel. He gave them instead The Law of Moses. They were the divers washings, and carnal ordinances, imposed on them until the time of reformation. They were the law of commandments contained in ordinances. When Christ came the law was done away with and the Higher Law was again restored. The Lord said "Behold, I say unto you the law if fulfilled that was given unto Moses".
God can and will call anyone to work for him, Moses was called when he was looking after the sheep that belonged to his father in law jethro. God spoke to Moses from the burning bush.
Moses was in Egypt, his wife and children might have been there or with Moses' father in law.