Adam Clarke's Bible Commentary Verse 6. Joseph died, and all his brethren] That is, Joseph had now been some time dead, as also all his brethren, and all the Egyptians who had known Jacob and his twelve sons; and this is a sort of reason why the important services performed by Joseph were forgotten.
Matthew Henry Commentary
Verses 1-7 - During more than 200 years, while Abraham, Isaac, and Jacob lived a liberty, the Hebrews increased slowly; only about seventy persons wen down into Egypt. There, in about the same number of years, though unde cruel bondage, they became a large nation. This wonderful increase wa according to the promise long before made unto the fathers. Though the performance of God's promises is sometimes slow, it is always sure.
Original Hebrew וימת4191 יוסף3130 וכל3605 אחיו251 וכל3605 הדור1755 ההוא׃1931