An uphill battle!! Exchanging two little vowels makes a world of difference. My “cousin” lady-friend has the maiden name “Landes.”  More times than I can count, I found the surname spelled “Landis,”  In our huge family tree, we have another surname debacle: “Flora” and “Flory.”  I have to search for sources using alternate surnames. Personally, I love the challenge because I consider it “mental gymnastics.” (I hope to keep my brain free of Alzheimer’s and dementia.)