It isn't easy....

Really being considerate of others feelings - not just your own.
Egos have no place in a family. We're all in it together.
Speak to each other as you would have each other speak to you.
Preaching falls on deaf ears. Don't talk about it - do it.
Each of us have feelings, take care with them -- and don't be harsh.
Children are not adults, and shouldn't be spoken to as such.
Treat each other with kindness and love.