Lois, The answer to you question is No and yes. No, My querey was about someone who married "Lord Nelson's" Sister. Yes, because at the time I was taking it for granted that the Lord nelson was Horatio Nelson's sister, whose married name was Matcham. I know believe it could be either Horatio Nelson, or his nephew who inherited the title The second Earl nelson. After all, he (the nephew) did have twin sisters. So I am not overlooking any possibility.
However, any all information that you may have on the Matcham line would be welcome, if you care to share it. Particuarly if there is a united states link, or even the possibility of such a link.
Thanks again, Keith
P.S. i will leet you know what else I find out as I read the biography that I referred to in my last e-mails.