Welcome to my first challenge! This might now be the best but I hope you enjoy.
Backstory: Your sim comes from a one of high class vampires, but ran away to escape the responsibility of always being "perfect". Your sims job is to start a new life, away from his/her responsibility, but the twist is that she/he is a vampire.
1. Can't talk to ANY vampires. (For they can report you to your family)
2. Start with nothing but one room. (To stay out of the daylight, you can add rooms later though)
3. Founder MUST be a vampire. (Use cheats if necessary)
4. Heir MUST be a vampire. (Be bit by the founder/or cheats)
5. No maxmotives. (Unless it's to save your sim from death)
6. No proper job until you have the basic necessities (Way to get food, bed, shower, toilet)
Goal: To make it to 10 generations (Or how many you prefer), and have 250,000 simoleons (To be a higher class family)
-10 points every time you come into contact with a vampire that is not in your family.
+100 for each child
+500 for every generation that became an adult
-20 points for use of cheats
+25 for every Boy/Girlfriend
+50 for every engagement
+100 for every marriage
Might fix a few things later but for now this is it. :D