YOU SAID:
Happy new year grandpa
INTO JAPANESE
新年あけましておめでとうございますおじいちゃん
BACK INTO ENGLISH
Grandpa a happy new year
INTO JAPANESE
幸せな新年のおじいちゃん
BACK INTO ENGLISH
Happy new year my grandpa
INTO JAPANESE
新年あけましておめでとうございます私のおじいちゃん
BACK INTO ENGLISH
Happy new year my grandpa
That didn't even make that much sense in English.