With the translators’ help, Joshua 13:29 reads: "And Moses gave inheritance unto the half tribe of Manasseh: and this was the possession of the half tribe of the children of Manasseh by their families [Joshua 13:29]." The addition of “inheritance” to the verse is negligible. The entire chapter is about “inheritances.” Like the (You) which attends many declarative sentences is understood without expression, “inheritance” is understood to be the subject of Joshua 13.
Without the translators’ help, Joshua 13:29 reads thus: “And Moses gave unto the half tribe of Manasseh: and was of the half tribe of the children of Manasseh by their families.” It's understandable if the translators were confused by the text of Joshua 13:29 as it was written. Moses was, by his own, utterly unreliable testimony, a Levite son of Amram of the families of Kohath– not of the line of Manasseh. The only problem with Moses' pedigree, as Moses records it, is that Amram was long- dead before Moses was born. It's impossible that Moses was, as he alleges, a child of Amram.
Joshua 13:29, could amount to an admission– compliments of a “Freudian slip” from Joshua's pen– that Moses, though a Jew, was not a Levite. Certainly the pedigree Moses provides himself is patent malarkey. Perhaps Joshua 13:29 was simply meant to signify that Moses couldn't remember which tribe he was from (if he was indeed of the twelve tribes). It could be that Joshua 13:29 is Joshua's politest way of revealing Moses' bastardly heritage (outside of Pharaoh's household).
Abarim Publications’ Dictionary of Biblical Names defines the name Manasseh as, “Forgetting, Evaporating.” Moses, in Genesis, says of the name Manasseh: “Joseph called the name of the firstborn Manasseh: For God, said he, hath made me forget all my toil, and all my father's house [Genesis 41:51];” meaning that, in the case of “first mention,” Manasseh is related to bastardization. A bastard is one who knows not who their father is. If Moses knew who his father was, he certainly didn't tell the truth about it anywhere in the ‘Holy Bible’.