Who was Moses' father-in-law?

Question

Exodus 3:1
Now Moses kept the flock of Jethro his father in law.

Exodus 4:18


And Moses went and returned to Jethro his father in law.

Exodus 18:1
When Jethro, the priest of Midian, Moses' father in law....

Exodus 18:5
And Jethro Moses' father in law, came with his sons and his wife unto Moses ...

Judgges 4:11
Now Heber the Kenite, which as of the children of Hobab the father in law of Moses.

Numbers 10:29
And Moses said unto Hobab ... Moses' father in law.
Exodus 2:18-21
And when they came to Reuel their father, he said.... And Moses was content to dwell with the man: and he gave Moses Zipporah his daughter.

Answer 1

His grandfather, who is also his cousin, who is his brother's dad, who is also his father. No really, I don't know but aparently neither does the All knowing Bible.

Answer 2

I got this off of blueletterbible.org, it is from eastons bible dictionary:
Hobab:

beloved, the Kenite, has been usually identified with Jethro (q.v.), Exd 18:5, 27; comp. Num 10:29, 30. In Jdg 4:11, the word rendered "father-in-law" means properly any male relative by marriage (Gen 19:14, "son-in-law," A.V.), and should be rendered "brother-in-law," as in the R.V. His descendants followed Israel to Canaan (Num 10:29), and at first pitched their tents near Jericho, but afterwards settled in the south in the borders of Arad (Jdg 1:8-11,16).

Answer 3

Jethro Tull

Answer 4

Either Jethro had more than one name, like a first and a last, or a name that meant "son of" or something.
OR Moses had more than one father in law.