Withering family size is a trend here in Canada as well... my great-grandfather (like the good Irish Catholic that he was) had 13 children in his first family and another 11 with a second wife after the first one died in child birth! My grandfather had 5 kids and my father had just one (me).

My family tree has a great girth in the roots but they seem to be digging less and less deep as time goes by. A product of the modern world or a result of changes to the immigrant mentality once established in a new home?