My birthday is Feb. 20. I share my birthday with my father-in-law. Needless to say if my DH EVER forgets my birthday he's really going to be in trouble!! LOL
I feel bad for my SIL. Her birthday, her daughter's birthday, her newborn sons birthday, and mother's day are all within two weeks of each other. Balancing all those days and making everyone feel special would be very difficult.