Albert Barnes Commentary Jeremiah 32:7

"Behold, Hanamel the son of Shallum thine uncle shall come unto thee, saying, Buy thee my field that is in Anathoth; for the right of redemption is thine to buy it." — Jeremiah 32:7 (ASV)

Hanameel was strictly the first-cousin of Jeremiah. In Hebrew, all the terms of relationship are used in a more loose way than with us.