It look like we're talking about the same family! I will try to find out some of the exact names we have, although I don't believe we know a lot, as my grandfather, Philip Henry Portlock, passed away quite young and my grandmother really didn't keep in touch with his family.
If you do make it up to Massachusetts, please give me a call at 508-994-6588, or contact me at 233 Bakerville Road, South Dartmouth, MA 02748. It would be nice to meet some more family members from the Portlock side!
I will let you know what I can find out re: names in Grandpa Portlock's family.
Best wishes, and I look forward to hearing from you.