My Canadian brother is married to a native Chinese and lives in Texas. Their six-year-old daughter is perfectly bilingual in Canadian English and Chinese, but it's precious to hear her Texas "y'all". What's really funny is when she's been playing with her African-American friend, and comes away imitating an accent from the 'hood.
I guess their daughter is headed for the TX governor's mansion in 2045?
... eh?
A friend of mine has a father who is native African and a mother who is Scottish. They moved to the U.S. when she was 3 and became citizens. She speaks pure southern. To listen to her next to her parents with her accent is hilarious. :)