yes. you need to becoe a romantic interest by kissing them or confessing attraction. Then propose going steady, finally propose marriage.
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The same way any two sims can marry in the Sims 3
Unfortunately you can not marry teens in sims 3. :(
You cannot.
To become a business partner in the Sims 3, all you have to do is click on the place that you want to partner and click the interaction "Become Partner for $......." To become a partner costs A LOT of simoleons so make sure you have enough money to do so.
all you have to do is if you live with them make one relax on the bed then switch person and get them to join them if they dont live together get them to marry and they will move in together