[quote=Jig]
No, that's normal. Accents are fluid and they change according to who you're with.I live in an area with a particularly distinctive accent that I've mostly avoided. My best mate has a distinct tang of it and so does her mother, and when they're together their accent thickens to the point where I can barely understand them. Just like you imitate body language of the people around when you/in order to forge a connection with them, you do the same with linguistic cues, such as accent and vocabulary.
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I've never heard of this, nor experienced it.

Me, my mother and my sister have moved abroad to move in, and we've been here for several years.

Accents and voices sound completely the same as before.

Does it depend if you live in a certain country long enough? Lets say you were in Boston, developed a certain accent, for 30+ years, would a voice still change when moving away from home for an extended period of time?

Because I have NEVER seen what you've said in your post. But it's my own personal experience and everyone has different experiences so...