At this point, Joseph had been away from home for twenty years (cf. Gen 37:2, Gen 41:46, Gen 41:53) and had seen neither his dad nor his brothers even once in all that time. When he was sold into slavery, Joseph was just a young teen-ager; now he's in his late thirties. He was just a boy then; now he's a man.
Here is were I would disagree with the tradition that you are basing your posts on.
The bible is silent as to when the seven years of plenty began in the story of Joseph's life.
It is my contention that Joseph was probably around 52-55 years old when his brothers first went down to Egypt to purchase Grain for the following year. Why is this my contention? 20 years between Joseph being sold into slavery and when Jacob goes down to Egypt is not enough time for Judah to father two generations, particularly when Er and Onan both die after marrying Tamar before Judah goes into her, believing that she is a prostitute, and subsequently fathers twins, Perez and Zerah, with Perez then fathering Hezron. Hezron is taken down to Egypt as a young child, when Jacob goes down. The 22 year time gap, that the tradition you are using, is suggesting, does not provide enough time for Er, Onan, Perez, Zerah and Hezron to have been all born during this time period.
However, a 36 year time gap, as I am suggesting, is adequate for the births of Er, Onan, Perez, Zerah and Hezron to occur, if Er marries Tamar when he is still young, i.e. let us say around 15 years old, with a 3 to 5 year gap before Perez and Zerah is born and then Perez being around 15 years old before when he marries and then fathers a son around 1 year later.
This has been my issue with your posts based on the traditional understanding of the Genesis story because of the assumptions made out of the silence of Genesis as to when certain events took place. The clues are there in the Genesis account, but it does require some grey matter to put the story together a little more accurately when considering all of the facts provided in the Genesis story.
Shalom