No. Apostrophes are rarely used to make nouns plural. "Remember to dot your i's and cross your t's" is one of the rare instances that apostrophes are use to pluralize something.
As a plural, for more than one dad; no, does not need an apostrophe. As a possessive, as in the item belonging to dad, then yes, it does need an apostrophe.
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If you're talking about more than one employee, then don't use an apostrophe. Plural words should never have an apostrophe. If you're talking about something that belongs to a single employee (such as "the employee's computer") then you need an apostrophe.
I am does not need an apostrophe. It is only when you make it into a contraction by dropping the a that you need the apostrophe. It becomes I'm in that situation.
do you need an apostrophe after the s in Koreans
No. The Cannons doesn't need an apostrophe.
No, Christmas Eve does not need an apostrophe.
No, because plurals do not need an apostrophe.
No you don't! Horses does not need an apostrophe.
No. Harringtons doesn't need an apostrophe.
The plural "Thursdays" doesn't need an apostrophe.
the word 'infants' doesn't need an apostrophe, unless you are saying they owned something, for example, the infants' play (plural/more than one infant).