If a word ends in 'y' change it to 'ie' before adding the 's'. Like these words: company/companies, fly/flies, kitty/kitties, spy/spies, reality/realities, family/families, party/parties...simple, really.
One exception to the rule is in the case of proper or family names. If I want to see the whole Murphy family, I would say, "I'm going to see the Murphys today." You never want to change the spelling of someone's name.
Use the apostrophe to denote possession (Margie's blog) or a contraction (can't be beat!). This will make your apostrophe and your friendly copy editor very happy!
I hope you are enjoying your summer! Please let me know if you need help with a project, as I am scheduling for the fall now. If you have a rush job, I can fit you in this summer, too!