This isn't another one of those articles where i guess who Luffys mom is. I just wanna share what i think happened to her. I believe Luffys mom was killed by the marines (possibly Luffys grandma as well). Dragon understands this when is wife is killed thus explaining why he chose to start the revolution against the marines. I have no proof of this, its all from my imagination, and we wont know for sure until Oda says otherwise. So what do you think?