Why do you think our biggest enemies are members of our own family?

I find Matthew 10:36 to be so true, my older sister and her husband have made my life hell, for many years, and they have turned other family members against me as well, could it be that there God is money and mine is Jesus Christ, ive never been rich or successful like them, and im a cast away, never get invited to family reunions, and i pray The Lord will remove my bitterness for these people, anyone else in my shoes?