Bella, the youngest of Santorum's seven children, suffers from a rare chromosomaldisorder called Trisomy 18, which causes severe medical and developmental problems.
Her 18-year-old son Jermarl Henderson, who has a chromosomaldisorder called DiGeorge Syndrome, has had multiple open-heart surgeries and requires intensive, complex therapy, she said.
English Heritage said results of recent analysis of Peter's portrait by a professor of genetics, now suggested he had Pitt-Hopkins syndrome, a chromosomaldisorder first identified in 1978.