Love is neutral energy. According to the True Reality of Sexuality, it has six sides: Love, Fear, Control, Intimacy, Trust and Manipulation. (44)
You can unconditionally love and fear your sons at the sametime. A great example is the movie Underground Evolution. Ancient monarchs probably feared and loved their children.
Other examples. Parents can also be scare for you and try to control your life. Young adults may manipulate their mates if they fear them finding love elsewhere.