He seems to be settling in well to life in Florida; I even noticed the slight twinge of an accent in one particular word when speaking to him recently.
His reading is now superb, no more problems with long words, and he is enjoying the company of other children of his own age. His school (Riviera Miami) has an excellent reputation.
Lady Magnon spent about 7 or 8 years at school in Washington DC, and came to no serious harm. When she was eventually sent to an English upper school (on the Isle of Wight), she arrived there with an American accent, which her new Headmistress would not tolerate. She was made to attend elocution lessons at once, and the problem was soon solved. Her English is now spoken with an English accent.
My daughter who has lived in Oz for about 15 years (presently in Brisbane) shows no sign of an Aussie accent; which I know can be very easily adopted; I can't say the same for her two boys.
I, myself, have lived in France for nearly 50 years, and other than throwing my arms around erratically, and regularly peeing outdoors, I offer not a hint of a Gallic accent; although I believe I do speak French with a south western twang.
I have a feeling that the next time I see Boo Boo, he'll be encouraging me to 'have a nice day', wanting to play Rounders, and talking about 'Football'; but not the proper kind.