“家谱”常见的英文表达是 family tree 或 genealogy。
family tree:更为通俗常用,形象地用“树”来比喻家族成员的分支和传承关系,例如:I'm trying to draw a family tree to understand my ancestors better.(我正尝试画一张家谱,以便更好地了解我的祖先。)
genealogy:是较为正式、专业的词汇,侧重于对家族世系、血统关系的研究与记录 ,例如:He has spent years researching his family's genealogy.(他花了多年时间研究自己家族的家谱 。)