The following reply was made in a discussion of the following two verses:
"And Amram took him Jochebed his father's sister to wife; and she bare him Aaron and Moses: and the years of the life of Amram were an hundred and thirty and seven years." (Exo 6:20)
"And the name of Amram's wife was Jochebed, the daughter of Levi, whom her mother bare to Levi in Egypt: and she bare unto Amram Aaron and Moses, and Miriam their sister." (Num 26:59)
There are several things we are TOLD in these 2 verses:
1) Jochebed was Amram's aunt (father's sister)
2) Jochebed was Levi's daughter
3) Jochebed was the wife of Amram
4) Jochebed begat Aaron and Moses and Miriam to/for Amram
5) Levi's unnamed wife begat Jochebed to/for Levi
6) Jochebed was born in Egypt
Now, assuming that "begat to/for" means a direct son, there are other things we can DEDUCE from what we are TOLD:
1) Amram's unnamed father was Levi's son
2) Amram was Levi's grandson
3) Aaron was Levi's great grandson
Also, given deduction #2 along with Exodus 6:18 (that Kohath's son was Amram), we can determine that Amram's unnamed father was Kohath.
Now none of this becomes particularly difficult until one realizes Israel was in Egypt for 430 years. This is a problem because we concluded earlier that to "begat to/for" indicates an immediate son or daughter, and this same word is used for both Jochebed's birth to Levi (and unnamed mother) and of Aaron's birth to Amram and Jochebed. One can do a bit of simple math to determine this would require Jochebed to be around 250 years old when Aaron was born (430-83-97). This is obviously a problem given that Abraham's wife Sarah thought it impossible she could have a son at 90 years old. Now the solution to this apparent problem is to realize that the meaning of the word "begat" is NOT actually modified when followed by an individual's name with a lamed prefix, so that begat can still refer to either an immediate son/daughter or a descendant son/daughter.
I will once again refer to Dr. Green of Princeton, who over 100 years ago proposed that Amram and Jochebed were not the parents of Aaron, Moses and Miriam. I believe Dr. Green had a pretty good knowledge of Hebrew himself, as well as chronology issues.
Another paper by one of Mr. Thiele's associates (or students?) who also addresses various chronological issues.