I found the attached on someone's Flickr account.
Thank goodness for screen caps. It's dated Oct 2011, so it should be reflective of pricing at that time. Did the rep say what kind of minutes you would get on the Family plan? If it was unlimited, it would be around $200.
$119 for minutes
$30 for your unlimited data on your phone
$30 for 2Gb tiered data
on the new phone
$10 to 20 for taxes, etc
Not including texts. I didn't see unlimited text on this screen cap.
I've never had a Family Plan so I'm just roughing the numbers based on the attached image.