I am so sorry for how late this response is. I just saw your post, so you may know this already. But as a coincidence, I was looking at old, old LA newspapers online last night, trying for research on Livingston Parish. There was a snippet abt H. G. and how he was editor of paper. It specifically states that he is the brother of "Mrs. Robert Sparks" while listing his "credits" as a person. I hope this is not too late to help you.