Is hacking someones Facebook and Yahoo accounts a felony? Is it a Homeland Security issue?

My son's Mother-in-law has been going secretly into my sons FB and other social network emails and relaying "bastardiized", inflammatory versions of information she finds back to her daughter, outright lies. I know, my son is on my FB page, etc. I need to give my son and daughter-in-law an aswer to... show more My son's Mother-in-law has been going secretly into my sons FB and other social network emails and relaying "bastardiized", inflammatory versions of information she finds back to her daughter, outright lies. I know, my son is on my FB page, etc. I need to give my son and daughter-in-law an aswer to these questions. Please advise, what would be the next step?
Update: My son did not give up his password.
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