his mother's father
his mother father
det:poss adj n
his mother's father .
h ɪ z WORD_BOUNDARY m ʌ ð ɚ z WORD_BOUNDARY f ɑː ð ɚ WORD_BOUNDARY
h i s WORD_BOUNDARY m o t h e r ' s WORD_BOUNDARY f a t h e r WORD_BOUNDARY