My Father Is 73 Years Old, Her Doctor Said That

my father is 73 years old, her doctor said that he in vegetative stage, he now in home care taking care of caregiver, before he got that stage, he had already undergo a angioplasty 7 years ago at the same time his kidney is also in maintain medication. his creatine result around 2.32-3.37 ,so last October 5,2016 he suffer cardiac arrest, resulting 12 minutes no pulse, then 10 minutes before he revived, now he in vegetative stage as his doctor said to us, but not death brain , as per EEG result he still brain activity. as per our observation now, eye opening daily, and every time we ash her "DO YOU HEAR US" he will blink her eyes, sometimes he do yawning, is this a good sign? hiccups sometimes, and sometimes he do some finger movement but not spontaneously. Please give us some advice or tips.