Most siblings born on a leap day

Most siblings born on a leap day
Who
Henriksen family
What
3 total number
Where
Norway (Andenes)
When

The three children of the Karin and Henry Henriksen (Norway), Heidi (1960), Olav (1964) and Leif-Martin (1968) all celebrate their birthdays infrequently, as they fall on Leap Day - 29 February.