YOU SAID:
i am old now and i have grand kids
INTO JAPANESE
私は今歳で、孫がいます
BACK INTO ENGLISH
I am now and have grandchildren
INTO JAPANESE
私は今、孫がいます
BACK INTO ENGLISH
I now have a grandchild
INTO JAPANESE
私には今孫がいます
BACK INTO ENGLISH
I now have a grandchild
That didn't even make that much sense in English.