co·in·ci·dence (kō-ĭn'sĭ-dəns, -dĕns')

n. A sequence of events that although accidental seems to have been planned or arranged.

Check this out:
• Big Bro was born 5/20/04
16 mos and 6 days later...
• Little Bro was born 9/26/05
16 mos and 6 days later...
• Soon-to-be Little Sis was born in Taiwan 2/1/07

Coincidence? I think not.