My brother and I were born on the same date (14th May), one year apart, me in 1958, he in 1959.
Our cousin was born in 1960, only five days later on 19th May.
In that five day period - 14th to 19th May - we also have a gt grandmother, an aunt, and another cousin with birthdays.
On a more sombre note, since 1985 we have had three close family members die in the same five day period of September, with an interval of twelve years between each death. Spooky.