Last night, my son (4.5 years old) was brushing his teeth and proceeded to spit the toothpaste in my husband's/his father's face (and laugh). The day before, he spit on his phone, tried to run him over with his tricycle, along with several other belligerent acts. This is a common/daily occurrence. And, the aggression is solely targeted towards my husband. The dynamic between them is frustrating and tiring for my husband and for me. My husband desperately wants a good relationship with our son, but my son seems to thwart all efforts.