A Facebook sperm donor fathered 15 children but never told the mothers he has an inheritable condition that causes learning disabilities. James MacDougall, 37, fathered children with lesbian women through private donations advertised on social media despite knowing he had incurable Fragile X syndrome, a genetic disorder that leads to low IQ and developmental delay. MacDougall’s identity came out in a family court battle in Derby, United Kingdom, after he applied for parental responsibility and child arrangement orders for four of his children — even though he originally signed an agreement saying he didn’t want contact with some of his...