Darren,
I think that, as a theme, this has already been explored somewhere on Rootschat - I seem to remember I started a thread when I discovered that my gt-grandma Annie Sherwood (nee MILES) had given birth to NINE consecutive boys as a gentle start to producing and rearing children in the late 1870's. The challenge was then to discover if anyone had experienced a larger number of consecutive same gender births in their own family, and this then evolved into which woman had managed to keep giving birth to children for the longest number of years.
If I remember correctly, it was in excess of 30 years, extraordinary...
keith
N.B. The length in years between oldest and youngest sibling in a generation, and then also someone marrying and producing children late in their own life are the two factors that produce the large gaps between d.o.b. of a grandparent and one of of his/her grandchildren, of course...
...very naughty of me, because this is off topic somewhat, but my gt-grandma Annie had her first child in 1878, aged a mere 15 (she 2 years later married the father) and until recently I thought her last birth was twins in 1903. But I have recently discovered that she had a baby boy called Nelson in 1907. After that, I reckon she'd "done her duty"....no offence to our great Admiral intended...!