I just checked - in the original v0.96c files there is currently no such phrase as "my best friend's son". There are phrases like "my friend's son", but even a phrase like "my best friend" simply doesn't seem to exist.
I made a screenshot of the grep results, because colors make it easier to notice found matches
View attachment 3207538
I'd like to see a screenshot of the game with a text "my best friend's son" or whatever else there still is that the patch is unable to handle correctly.
Bug or error reports have to be as accurate as possible. Otherwise they are useless.
Phrases such as "friend's son" should already be handled correctly. I do seem to rememeber there being at least a couple of different ways "
friend's" was written in the code, either by using different apostrophes or possibly an apostrophe with the escape character being used, which is why my patch uses a regex "friend..?s son" to catch both. I'm not sure how Hynegard's patch handles them.