I wrote about this a year ago and I still love—and use—this idea:
Control is connected to resentment and to difficult people in our lives. A friend gave me this practice to try with anyone who challenges us. Here is what she suggested:
Early in the morning or late at night—when you can imagine that the other person is sleeping—visualize your higher or best self who is wise and compassionate, and in your imagination allow your higher self to visit that person. See your higher self using a pair of beautiful golden or jeweled scissors and cutting the cord that attaches you to that person. See the cord connecting you fall away and then bless that person and see your higher self return home to you. Allow the blessing to fall on your self too and thank your higher self and your higher power.
Do this visualization as many times as you can over two to three weeks and you will find that your resentment, obsession and struggle with that person will lessen or disappear.