diadochokinesis

Actually, not necessarily and very rare. I'm a dialect/accent coach and have been doing it for 10 years. Accents can be taught but you don't necessarily pick up an accent just because of who you are married to or where you live. I'm an expat and have lived overseas for awhile now in the Middle East but I don't speak with an Arabic accent. I still have my Southern accent. One of my best friends is Egyptian and even teases me that I speak Arabic with a Southern accent. Her accent is "fake" in that she worked to learn it. It doesn't come naturally to her. It also isn't picked up from PK because of the various differences (listen to the vowels and the intonation patterns).