傳家之寶 的英文怎麼說?

[1] (family) heirloom[2] a family possession handed down from generation to generation

heirloom = 不一定是值錢的東西, 卻是家家代代傳下來的東西 = 一代傳一代的東西，可說是傳家之寶，但不一定很珍貴

a family possession handed down from generation to generation 是白話的說法。