You need to click the family relationships button in create a family which looks like a small family tree. The game will tell you what to do from there.
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You can't.
Oh, what a happy little question! In Sims 2, you can create a new Sim that's not related to any other Sim by selecting "Create a Sim" from the main menu. From there, you can customize their appearance, personality, and relationships to make them truly unique. Just remember, there are no mistakes in Sim creation, only happy accidents!
ewww and no, not unless their related by marriage. But you can make sims have the same last name even if they aren't made at the same time. Then you can have a Mr. Smith already in the neighborhood and create a Miss Smith. Move them in together and have them fall in love.
Boyfriend.....you can't create a boyfriend. These are the 3 things you can do to create your own sims: 1) You can create a sim along with your girl sim and call them "Housemates". Then, along the game, get them to date using romantic interactions. OR 2) Create the sims in create a sim and call them "Spouses", that, though, will make them married. OR 3) Find a cheat online....
There isn't a Church in The Sims 2, however you can make your own as a community lot. In the related link below it shows you how.