Frances

My point was a 16 year old boy could father a child... and from this publication it looks like it occurred

The source was the Manx Note book

Legal Age for Marriage (From Manx Note Book)

Roman law gave the minimum age for marriage as that of puberty which was 14 for boys and 12 for girls; these remained the legal age for marriage until the late 19th Century...
....There is however evidence that child marriages were reasonably common in North West England in the 16th century - there is a case in 1637 presentments petitioning for divorce from such a marriage. However most did not marry until 18 or older though the Manx have always had a reputation for early marriages.