We can choose to be happy, or we can choose to be sad, upset, depressed, etc. The situation doesn't make us feel anything, we choose how we react to every situation. 

I choose to be happy no matter what comes my way, because I am alive and able to live my life. Besides being upset or angry over situations that we are unable to control, is a massive waste of energy in my opinion. 

Life is too short to be wasting energy on being negative, sad, depressed, mad, angry, etc. When you stop to think about it, you realize that we have no guarantee that we will be here 50 years / months / weeks / days / etc, from now. If we're young the odds are typically in our favor, but people of all ages die every day. For this reason we must be living our best life every day, and we need to be eliminating hate, anger, frustration,  etc. from our lives and if we are in conflict with any family members - we need to resolve it immediately. Even if the other person is not willing to forgive and forget and move forward, we need to make the effort to resolve all family issues and to never let such issues happen again in the future. 

We can only control our own thoughts, words, and deeds, so if we want to fix someone we need to put our energy into fixing ourselves. Everything else and everyone else has to fix their own problems. Living this simple concept, will help us to live a more happy, healthy, joy filled life.