Write out a Prayer of Friendship and read it as a meditation on a regular basis.
Here is an example:
May my mother and father live in peace and harmony.
May my brothers and sisters live in peace and harmony.
May my friends and neighbors live in peace and harmony.
May the friendly, strangers, and the unfriendly live in peace and harmony.
May I live in peace and harmony.
May my words and actions contribute to the happiness and welfare of others.
May the power of my friendship transform difficult situations.
May all beings live in peace and harmony.