It does take a few days for vampires to change from a sim to a vampire so patience is key. If you want to be nice you can become really good friends with these sims and then offer to turn You’ll need to have a good relationship with 5 of your vampire offspring in the next part, so it makes sense to do it nicely and grow the relationship. Then you can click on a sim and in the vampire menu you’ll see convert to vampire and your sim will bite them. The mean way to do it is to do it without asking permission, which you’ll need the vampire creation power from your vampire perks to get it done. To be able to turn someone into a vampire you can either choose to be nice or be mean. These sims are going to be considered your vampire offspring, often confused for your vampire children, but they are just anyone you turn into a vampire. Next, you’ll need to convert sims into vampires. You can do this by doing vampire sparring, asking a vampire to train you, and reading the vampire tomes. To become a prime vampire you’ll want to continue to learn vampire lore skill and continue working on gaining more vampire experience to get to the prime vampire level.