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Interesting, but I think we both know I wasn't trying to claim any actual legal right to bear arms!
Whether officially binding or not, a quick Google search shows multiple sources with the same crest and motto for both families, and I found that curious so wondered if anyone knew more.
Late response, but generally in the UK ( and most Western European countries) Heraldry is owned by a specific individual. Family crests and coats don’t exist, arms are owned by a single armiger (one who owns the arms) and transmitted father to son. Second, third, fourth sons would have devices that would indicate so.
I don’t think there are rules governing motto, you have multiple clans using “Touch not the cat but a glove.” Technically clan crests are the personal property of the clan chief, anyone however can display a clan’s “crest badge” in a single colour.
I'm calling bullshit, but if you really think you're entitled to heraldic arms, https://www.college-of-arms.gov.uk/ will confirm it.