Bible Answer: The motto your parents have is taken from the Word of God. "Do not be overcome by evil, but overcome evil with good" (Rom 12:21). Right now I can sense that you are being overcome by evil. This happens when you allow what others are doing to get on the inside of you to torment you.

I don’t think your parents feel like doormats. You are the one who feels like it.

Please understand that what your parents are doing—walking in love—keeps people from dominating them. It protects their hearts from anger.

You see, people can do things to you but if it doesn't get on the inside of you, they can never rule. Your parents need to be commended for their love walk, not called "crackers crumbs." They’re in charge, not the other family members. They’re not doormats, you are! You have allowed them to make you a doormat, your parents haven’t.

The other question is, will these unruly family members change? Maybe they will. There is no guarantee, though. Romans 12:17-18 says,

Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody. If it is possible, as far as it depends on you, live at peace with everyone.

The Bible says: "If it is possible, as far as it depends on you, live at peace with everyone." This Scripture implies that it is not always possible to live at peace with others, so sometimes you just need to keep your distance from them. At the same time, this scripture says as far as it depends on you. It doesn’t depend on others, but on you personally. It seems to me that your parents have lived at peace with these disrespectful family members. Their greatest motive appears to be winning them to the Lord. Don’t let them get the best of you. Choose to walk in love. Their eternal soul is more important than your feelings.