There's true history in this family history – the kind that can be documented by ships' manifests and fascists under oath at their own trials – but there is also family history, the kind where cousins and in-laws insist the other one is wrong, misremembering, incorrigible. Wry old men snort and amused old ladies "tch!" So we understand each other going on. Heinrich Weiss, my great-grandfather, was a brilliant jeweler, but was by all reports…