This Bible contradiction is from the Skeptic's Annotated Bible.
Exodus 3:1 View context
Now Moses kept the flock of Jethro his father in law, the priest of Midian: and he led the flock to the backside of the desert, and came to the mountain of God, [even] to Horeb.
Exodus 4:18 View context
And Moses went and returned to Jethro his father in law, and said unto him, Let me go, I pray thee, and return unto my brethren which [are] in Egypt, and see whether they be yet alive. And Jethro said to Moses, Go in peace.
Exodus 18:1 View context
When Jethro, the priest of Midian, Moses' father in law, heard of all that God had done for Moses, and for Israel his people, [and] that the LORD had brought Israel out of Egypt;
Exodus 18:5 View context
And Jethro, Moses' father in law, came with his sons and his wife unto Moses into the wilderness, where he encamped at the mount of God:
Judges 4:11 View context
Now Heber the Kenite, [which was] of the children of Hobab the father in law of Moses, had severed himself from the Kenites, and pitched his tent unto the plain of Zaanaim, which [is] by Kedesh.
Numbers 10:29 View context
And Moses said unto Hobab, the son of Raguel the Midianite, Moses' father in law, We are journeying unto the place of which the LORD said, I will give it you: come thou with us, and we will do thee good: for the LORD hath spoken good concerning Israel.
Exodus 2:18-21 View context
And when they came to Reuel their father, he said, How [is it that] ye are come so soon to day?
And they said, An Egyptian delivered us out of the hand of the shepherds, and also drew [water] enough for us, and watered the flock.
And he said unto his daughters, And where [is] he? why [is] it [that] ye have left the man? call him, that he may eat bread.
And Moses was content to dwell with the man: and he gave Moses Zipporah his daughter.