I tested by making them bath/shower while both were in the same bathroom: They shoo each other out.
Yet, they did not become love interest: no heart icon in relationship. While both relaxing on bed, the Woohoo option appeared, so I thought I would try, knowing for sure either one would refuse. So I made him 'relax' on her bed to watch TV and chat as well. bodyguard walked in to use the computer (by free will). The daughter was relaxing on her double bed watching TV, Mr. I say what the heck, try making them to woohoo. He had a few chances to socialize positively with the mafia daughter, although no where close to romance yet. He is supposed to stay home all day (until I can figure out how to make him driving people around). I decided to add a bodyguard for a family so I made a male sim who is Brave, Loner, etc. Her life time wish is to be a surgeon, saving people (perhaps victims of her father's syndicate). She carries many good traits such as Good, Hardworking, etc. Yet his daughter, a young adult, is a good girl who wishes nothing to do with her 'family business'.
I have a family in which the head of family is of a shady evil branched criminal, a mafia boss.
Today I have encountered something upmost interesting: