Hello,
I do not know relatives of H.P., but am living in the home that H.P. owned from about 1870 - 1873. And by a pure coincidence, my father currently has an art gallery in one of the buildings where the pianos were manufactured.
Just thought you might like to know. I am trying to find a photo or any other info about the pianos. Would love to know if you know more about the pianos or H.P.
Thanks, Margy