I am in touch with the Phythian Adams family who are descended from a sister of Katherine Brownrigg and very interested and knowledgeable about the family. I will let them know about your message. Katherine's father, Thomas Richard Brownrigg, was Irish. I have just published a book about Thomas Ellis Owen who was Katherine's grandfather. It is called Thomas Ellis Owen Shaper of Portsmouth, 'Father of Southsea'. If you look on thomasellisowen.co.uk you will find further details about him.