Help! I'm terrified of my boyfriend's father, what should I do?

My boyfriend's father is a very intimidating man. Usually its the boys that are afraid of the girl's fathers, but this is a completely wacked out dad. He always looks at me as if he's sizing me up. I have been having trouble with work and school..and he always inquires about it. He seems to be more interested in my ability to be successful in this world than my personality & undying love for his son. I mean, I do everything for his son. Sometimes I even feel he is dissapointed with my looks..I am a tiny bit overweight. I heard that he used to weigh his wife (my boyfriend's mother) every single day because he wanted her a certain weight. I adore his mother but I feel she is even intimidated by this man. He has her completely whipped and even sets a bedtime for her -- 8pm! Is it wrong to always have it timed so that I don't have to run into him while I'm at my boyfriend's house (he lives on a set schedule)? How do I deal with this man to make dinners and holidays a little less awkward?