finally tonight here, 12 boys in a row. and now, baby 13. did science stack the deck? >> one, two, three -- >> reporter: the schwandt family from rockford, michigan. the line of shoes at the front door. can you imagine, 12 boys? the boys from 22 down to 1 1/2. and they've done the math. >> yes, definitely outnumbered at times. >> reporter: when the due date arrived -- >> baby coming tonight? >> no baby. >> reporter: and then tuesday night. >> it's go time. >> reporter: mom does not look amused. but she was ready. >> congratulations. >> reporter: and 9:00 a.m. yesterday morning, at nearly nine pounds -- number 13. >> hi, david! >> reporter: and mom here tonight with the answer. >> you know, it's still a little bit of a surprise but it is a boy. >> what is it? >> reporter: and dad let the other 12 boys know -- >> baby brother number 13.