Join Date: Jun 2004
Location: Santa Monica, CA
Programs: AA EXP 1MM, DL Silver, HHDmd, MBvLTPLT, PCAmb/Dmd, HYT Exp, WN A-List
Posts: 1,673
You can all board together between the A and B groups.
Our kids are currently 12 and 5. Most recent flight was 3 weeks ago LAX - BWI. Our boarding pass positions were 3 in the B50s and C1. But we all boarded after the A group. The other family taking advantage of family boarding that day was 4 adults and 2 kids (looked like grandma and grandpa with parents - one child was a baby).
In my 12 years flying with young kids, Southwest has generally been very good about accommodating families.