the best my family can do is greatgranma who had 10, and reared 7.
OH's granma was one of eleven all of whom lived and thrived until one died of TB aged 25.
However, my son-in law's father was one of 16, and granny is still alive in her late seventies, having brought up her own family, and several of her grandchildren. Admittedly, she had the benefit of modern medicine.
eadaoin