not at all. seeing as thai is his natural tongue it is coming back very fast. he is learning to read and write again and within 2 or 3 more years will be fully fluent.
he also speaks english with no accent. something very valuable here.
if we continued to speak thai with him in canada he would never of lost the accent. he would of spent his time swinging between languages. i knew coming back here he would pick it up very fast.