O'Neill is Roman Catholic and the couple intended to continue residing in New York immediately after their wedding, but their children will have to be raised in Sweden and as Lutherans, like their mother, in order to have succession rights.
O'Neill er romersk-katolske, og parret agter, at fortsætte med, at være bosat i New York efter deres bryllup, men deres børn bliver nødt til at opvokse i Sverige og som lutheranere, ligesom deres mor, for at få arverettigheder.