Hm, seems like i am in the top 3 here ^^
6 at the moment, 2 of those by blood (1 girl, 1 boy), 4 by marriage (2 girls, 2 boys). I am the oldest and the youngest is ca 10y younger than me.
And before anyone asks: all girls married or soon to be

(and with their own kids already)
Oh, and then there is the girlfriend of my father with 2 (or was it 3? not quite sure) kids too, so if those two would marry sometime in the future i would have 8 or 9, most by marriage. (Although writing "kids" at that age is a little bit strange, since i'm 28 ^^)
Can't tell how many cousins i have because of remarriages etc... at least 8, could be most likely more (no contact to some part of the family for over 15 years now...)