I think most of you have pretty small sample sizes. My DH is one of 14 kids (no multiple births, all the same mother and father).
They are B (stillborn), G, B, B, B, B, B, G, G, G, B, B (accidental death as a toddler), G, B
If they'd stopped having kids sooner, the percentages could vary hugely depending on where they stopped. I'm sure glad they didn't stop sooner--my DH is number 14.
The total ratio is almost 2 boys to 1 girl, but since 2 of the boys died it's closer to half and half of the living children.
Of the around 55 (so far) grandchildren, the ratio is around 2 boys to 1 girl--about the same as it is for DH's parents' kids.
I'm one of 3 girls, no boys.
DH and I have 3 girls, no boys.
The statistics that are really disconcerting to me are that there is a much higher incidence of stillbirths and SIDS in the family than normal, and lots of miscarriages.
11 of the 12 living siblings have children . . . I think almost all of those 11 families lost our first child to either stillbirth or miscarriage.
I'm not sure of the ratios of my DH's parents' families. But my dad is one of 6 kids B, B, G, G, (the girls were twins), B, B. All healthy uneventful pregnancies, I think.
My mom is one of 3, all born prematurely: B, B, G . . . my mom is the only one who survived, most likely because she was a girl and girl preemies are supposedly stronger than boys born at the same stage of development. My mom didn't have any miscarriages or stillbirths, though she had a threatened miscarriage or early labor with her first child (me).
I miscarried my first, then threatened to miscarry and/or go into early labor with all three of my living children, who all ended up being full-term and just fine.