Thanks, dear Bette, for thinking along. But even in such a small country as the Netherlands families easily lose contact. I knew of the existence of a brother of Jo, but he died before I could get to know him and ask after his sister. And probably due to the early death of their father, nobody else in my family seems ever to have heard of them ... So no letters from Jo flying around. And how religious affiliation could be helpful in tracking the lady, escapes me. My regards, W.