I can't remember where I found this, so I apologize for not providing the reference for you, but it has really been helpful advice for me...
Enjoy - Jess
The next time you see a person with whom you have a challenging relationship here are four steps you can take:
1. Mentally say to yourself, "Here comes my teacher."
2. Become aware of what qualities in this person are most irritating to you and try to identify in what ways these qualities reflect your own tendencies.
3. Remind yourself that this person, though a "teaching tool" for you, has his/her individual journey, and was this way before you, is this way with you, and will be this way after you. So, do not take it personally.
4. After having an encounter with this person, whether planned or unexpected, find a quiet place to do this short mental exercise: Close your eyes. Imagine a beam of white light coming out of your chest. As it extends about two feet beyond your body, see it curving to your right till it makes a complete circle around you. See the person in the distance. Breathe out gently and see your circle of light expanding in all directions until it embraces the person, and as it does, see the person lifting his/her eyes at you and smiling. Then open your eyes. Do this exercise for one week.