Thank you for your additional information to my posting. I did find the information on the childrens baptisms in the index of church records for Zuid-Holland District IV, with verification in the RK church records and the court record for the marriage in Rhoon. (You found this information much quicker than I did!) I will check the additional town of Oeffelt, Noord-Brabant. Do you have other ideas for finding Catholics in a Dutch Reformed area?