First of all, the vasectomy was 20 years ago in another country. Or was it maybe done at base by a military doc? Do you know how this would have been done in most countries at that time?
Secondly, this is anecdotal data, but overall numbers are solid in favor of vasectomy vs even the pill, so what you describe could happen with anything.
Thirdly, did he ever turn in sperm samples? Maybe it wasn't fully closed. Go to India and see a country doc do vasectomy on 30 people before lunch and then compare it to here with no scalpel.
And fourth, could she have cheated on him? Because IF she was still taking birth control pills the odds of conception by raw data would be something like 0.3 X 0.15= 0.045% in a year, or 0.15% if she had stopped taking the pills, which STILL is extremely low chance, making one suspect that is what happened. 20 years ago, the paternity technology was very poor.
Of course your scenario was a tragic one, but blaming the vasectomy sounds off.habibg said that, without Sperm samples, who knows if it actually was done good enough?
Last edited by WoundedTiger; 12-26-2016 at 02:26 AM.