BIG THANKS to sammi and the original poster
We called SW# to cancel the flight, and rebooked! Now our family of 5 saved $645 USD

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The SW customer representative told us that we can only use the remaining funds after we completed the travel, but it is good until 1-year after we originally paid (July). So that's no bad
A question - for those who had traveled with infant. Tonight the SW representative told me that since I am traveling with an infant I may not be able to do web check-in (i.e. boarding sequence)? Can anyone verify this? Prior to my booking in July, I called and they told me that traveling with infant will NOT affect web check-in.