Albert Barnes Commentary Jeremiah 32:8

"So Hanamel mine uncle`s son came to me in the court of the guard according to the word of Jehovah, and said unto me, Buy my field, I pray thee, that is in Anathoth, which is in the land of Benjamin; for the right of inheritance is thine, and the redemption is thine; buy it for thyself. Then I knew that this was the word of Jehovah." — Jeremiah 32:8 (ASV)

The right of inheritance is thine - Hanameel therefore had no children, and at his death the land would have been Jeremiah’s by right of birth. According to the Law (Numbers 35:5), it must have been part of the suburbs of Anathoth, within less than a mile, which was all the priests and Levites might cultivate.