population sensus :-)

Fathers side
Grand pa - Grandma 11 kids 
11 kids -> 30 grand kids ( 1 didnt have children )
30 grand kids ->  approx 37 + ( max 7) great grand kids.  4 grandkids didnt have any children - 9 had 1 kid
fertility went from 11 -> 3 -> 1.5

11->30->37

Mother side
9 ->  7 had kids - 12 grand kids -> 4 great grand kids -  2 definitely dont/wont have kids, 2 had 1 kid and 1 had 2 kids  
6 grand kids can still have kids - so max 12 more kids , out of this 2 are unlikely to have kids, the other 4 may have 5 kids - making it 9 total.  

9->12->9

Just having your kids married off and having kids well before 1975 has resulted in 3 times the spread of genes are after "hum do humare do" was introduced.  out of 30 grand kids on my fathers side, 3 siblings are responsible for 16 of that and the rest 8 for only 14 kids. My mothers side none of the 9 kids married before 1970s and so stuck to 2 max.  

Lol! I just had to do this analysis, no purpose what so ever.