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I would insist on an MRI of the person's head to rule out these things. They will of course find changes due to normal aging but should be able to exclude other things.
If you have noticed a mark change in personality or behavior in a loved one, report it to the person's GP or ask your own GP about it. It does warrant investigation, and you have done well to spot it and realise that it could mean there is something going on.
Makes notes, then seek advice - and be prepared to be politely persistent, because not every GP will immediately understand what you're concerned about. Well done, and good luck.