masculine options with the MC's father are coming, as far as Felix's father, you have to interact with Felix's mom but select the more feminine options with her. Masculine stuff will get you in a relationship with her, feminine options will get her to set you up with Felix's father.
For the guy in the restroom, I'm not quite sure I remember, I'll have to take a look, it may be something that I just forgot about, or it could be that your femininity is too low.