i had to look up how to properly make nouns possessive (really, it's been awhile) when two people own one thing, and as i'm a chicago manual of style afficianado, i ran straight to their website, and found the perfect answer. i think.
Q. Please state which of the following is the correct usage, sun and earth’s gravity or sun’s and earth’s gravity.
A. Since the sun and the earth each possesses its own gravity, make them each possessive: “the sun’s gravity and the earth’s gravity,” or, more concisely, “the sun’s and earth’s gravities.” When you refer to a single item that two subjects share, a single possessive serves: Claire and David’s house.
The
http://www.chicagomanualofstyle.org/cmosfaq.html
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