Thanks Grammar Lady!

Grammar Lady speaks the truth. Apostrophes are always used when determining possession. Make sure to put it before the ‘s’ to show singular possession such as  unlike this sad sign.

Even if there is an ‘s’ at the end of the word such as Smiths, you would still have a an apostrophe at the end of the word because it is a plural possessive. For example, “the Smiths’ car had a flat on the way to church this morning.” Or, “the boys’ tents wouldn’t set up properly because of the rain.” The Smiths' is plural because it's a family on their way to church. The boys' is plural because there are more than one boy setting up tents, therefore the apostrophe goes at the end of the word rather than before the s.

Artists aren't allowed to be ignorant anymore.

The apostrophes possessive rule is a bit of a complicated one but with practice one can master the apostrophe in no time!