I tend to use the posessive S when you would actually bother to sound out the extra letter. In my head I hear the posessive “Jones’s” as “Jons-zz”
I also had a cat named Socks. If his name were to be made posessive, I wouldn’t put the extra S sound, so it’d just be “Socks’ ”
This is a little punctuation quirk I’ve picked up over the years. I doubt I’m correct. What’s the proper rule on this?