Exodus 3: 1; Now Moses was keeping the flock of his father-in-law Jethro. 'Father-in-law number one.'
Judges 4: 11; Now Heber the Kenite, had separated from the Kenites the descendants of Hobab the father-in-law of Moses. 'Father-in-law number two.'
Now surely, the fact that Moses had two fathers-in-law, must ring a bell, can you hear it ringing young fellow?
From The JPS Torah Commentary: Numbers
29. Hobab son of Reuel the Midianite Probably "Hobab of the Midianite clan of Reuel." The identification of Hobab is difficult. He is designated here as Moses' father-in-law (also in Judg/ 1:16, 4:11), a role assigned to Reuel in Exodus 2:18 and to Jethro in Exodus 18. Three solutions have been proposed: (1) Hobab an Jethro are the same person and Reuel is their father, (2) the term hoten means a relation of the bride, hence, brother-in-law as well as father-in-law, by which Reuel becomes the father of Hobab/Jethro and the father-in-law of Moses, (3) Reuel is a clan name, as seen by its association with Midian (Gen. 25:3 LXX) and Edom (Gen. 36:17; I Chron, 1:35,37), and therefore hoten in this verse should be read hatan, "son-in-law," thereby making Hobab, the young desert scout of the Midianite clan of Reuel, Moses' son-in-law.
Which, if any, of these solutions is accurate? I honestly don't know. What I do know is that your certainty looks very much like adolescent cockiness.