We dont have any repeating birthdays but our days multiply together to make another family members birthday. My birthday
is 1/5, dh is 4/5 and youngest ds is 4/25: 5*5=25.
Ds #1 is 9/2 and ds#2 is 5/14, ds #3 is 2/28: 2*14=28.
My mom's birthday was 4/6/46 which I always thought was cool.