Is this a coincidence or does it have a supersition meaning behind it?

My mom birthday is on November 1, and my dad and uncle's birthday is on July 5th, my sister's birthday is on may 31 and my birthday is on december 20 and they all land on a tuesday of this year. Is there a superstitious meaning bhind it or is it just a coincidence? I've always been curious about this ever snice my sister kept running into the number "7:47" somehow. Thanks if you answer.