One thing they do have in common is stating that she used her ex husband's name on her son's birth certificate after she had remarried. That's just.... weird.
Yes that is odd. I mean, it is common (back then) for a divorced woman to maintain the last name of the man. But once remarried usually - not always - that name is changed to the current husband. It may be that she had not done all of the paperwork to have her name changed at that point.
I still use my first husbands last name. I have changed it to my current husbands on about half of my “official” stuff. Frankly, I just like the way it sounds in combination with my first name, LOL. I don’t like my first husband particularly, and haven’t seen him in decades, I don’t even know where he lives. I’ve been remarried about 10 years now, and my husband has given up asking when I will finally quit using the “other” last name.