Lots of shared birthdays

I have an only child, a daughter;<br /> My birthday 27th January, my son-in-law's mother's birthday 27th January<br /> My daughter's birthday 30th April her father-in-law's birthday 30th April<br /> I have two grandsons;<br /> My grandson Thomas' birthday 22nd February, his great grandmother's birthday 22nd February<br /> My grandson Matthew's birthday 23rd November, his great Uncle's birthday 23nd November<br /> Plus my husband and our friend Bob share the same birthday 17th March<br />