for the name Odysseus, if i want to add an s at the end do i have to write apostrophe before or after the s?

Odysseus's family
or
Odysseus' family

The first one is better, yes.

Yes that's what i originally thought but my English teacher wrote this on my paper:

If you were to need one you would write it like “Odysseus’”. When the word ends in an “s” you simply place the apostrophe after the ending “s”.

No, I'd put 's.

I'd also put 's on any name or singular noun that ends with -s.

James - James's
Charles - Charles's
Jan Jones - Jan Jones's
etc.

When adding an "s" to make a singular noun possessive, there are two correct ways to do it, depending on the style guide you are following.

1. Use an apostrophe after the "s":
- Odysseus' family

2. Use an apostrophe and an additional "s":
- Odysseus's family

Both are considered correct, but the usage may vary depending on the specific style guide you are following or the preferences of the publication you are writing for.

If you are following the guidelines of a specific style guide, such as the Chicago Manual of Style (CMS), the general rule is to use an apostrophe after a singular noun ending in "s" to form the possessive. However, CMS also allows for using the additional "s" if it improves the readability or pronunciation of the word.

Therefore, in this case, both "Odysseus' family" and "Odysseus's family" are correct, but you should choose the one that aligns with the style guide or personal preference you are following.