I agree with Jeremy's comments. One great grandfather had 8 children with my great grandmother between 1870 and May 1893 when she died. He then remarried in November 1893 and had another 8 children that I know of with his second wife between 1893 and 1906. Another Irish grandparent had 2 children in Ireland pre 1835 and then remarried in Australia in 1851 and went on to have another 12 children with the last born when my g grandfather was in his 70s. Also I have a friend who is an aunt to a nephew who is older than she is. She is the youngest of the family and her nephew is her oldest sister's child. There is over 18 year difference between the birth of the two sisters. Another friend is one of 13 children and the youngest child was born 25 years after the oldest. Anne