A Jesuit reader from Ireland writes:
It's worth noting that, with the exception of Bishop Samuel, all of William Wilberforce's sons became Catholics, as did Bishop Samuel's daughter. Their journey from a very evangelical Anglicanism to Catholicism was extraordinary.
The bishop and one of his brothers were married to sisters of the lady who married the future Cardinal Manning. The bishop and Dr Manning used to address each other as "Dear Brother", though the relationship became strained in later years.
Moments before he died in a horse riding accident, Bishop Samuel was talking about (and deploring) conversions to Rome.
Wilberforce himself was also a supporter of Catholic emancipation.
From Zadok, a photograph of Robert Isaac Wilberforce's tombstone in Santa Maria sopra Minerva.