Confusing? Yes, it sure is! Seems you have it somewhat figured out, but wow, sometimes it is surprising how complicated things/relationships and such were 100 or more years ago! So, is/was Matilda a Destish or Destash or a Lacourt, originally?
I have read, and have been told numurous times to not worry if names are spelled a bit differently, as there are many reasons for that..some of which, may or may not make them the same person/family and so on.
The Destache's we have in our tree, have been spelled a multitude of ways, including even for the same person variations exist in census documents, gravestone markers, and such...and even if they are spelled a bit differently is quite obvious that these are the same Destiche person!
I do have Louis Destiche marrying a mattlda lacourt in Menomonee Michigan about 1900.