Interesting forum, Arthur. Bookmarked. Thanks.
Mind you..... a sister's husband's second cousin isn't a close relative. I'd say it's a fairly distant relative of the poster. I have to work with the "table of kindred and affinity" that sets out who folk cannot legally marry.... it turns out that a person's own cousin is sufficiently distant a relative for them to be allowed to marry each other. I'm wondering if the poster is thinking of the children of his sister's husband's cousin? Some folk reckon that's a second cousin relationship, but it's a first cousin once removed. A second cousin is a bit more distant than that.