先祖伝来の家宝を英語でなんと言うか？

先祖伝来の家宝、家財などは heirloom です。44:08 it's amazing to think that silk has been a part of Japan's culture for over 2,000 years. sericulture was brought to Japan around 300 BC. from that time on, families throughout Japan produced the treasured fabric by hand. a kimono created out of handmade silk is a cherished heirloom. 手作業で丹念に紡がれた絹糸で織り上げられた着物は家宝として大切にされる。

What the Ancients Knew - Japan
https://www.youtube.com/watch?v=zR-rXSghPK4  0:50 the family plans to keep it as an heirloom.このケーキは先先代からの家宝として大切に保存したい考えだ。
Man Finds Grandparents' 100-Year-Old Wedding Cake Preserved in Hat Box

練習問題解答
a-3721 heirloom
a-8055 an heirloom
a-8776 her stolen family heirloom
a-9984 an heirloom
b-0523 a family heirloom
b-2710 historical family heirlooms
b-3718 an heirloom