1. This piece of jewelry is an heirloom that has been passed down all the way from my great grandparents.2. This gold hairbrush is our family heirloom, and I will give it to you when you get married.
 (family) heirloom a family possession handed down from generation to generationheirloom = 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。
Being able to speak at the age of one, the boy has unlimitd potential when he grows up.