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I would also like to be clear that I use NO mods or hacks of ANY kind.
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As I am EXTREMELY curious about this odd glitch, I am going to let this continue. As I was checking the family tree, I saw that there is now a yellow line connecting them, and upon checking it, it shows them as engaged. However, it continued unsupervised, as neither he nor she was not part of the main family. A few days after prom, Declan aged up and I moved him out of the house, assuming the relationship was a fluke. At prom, I got a message saying "Cynthia asked Declan to be her boyfriend!" It turns out, his sister was his prom date. The following day, Declan got a phone call saying "Cynthia is asking Declan to the prom!" I assumed it was a different Cynthia, so I said yes. The next day, there was a messing saying the prom was in a few days. Here's how this incest happened: Cynthia became a young adult, and I moved her out of the house. We all know that Sims3 has bugs, but this is more.
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The sims in question (Declan and Cynthia Dobbs) are indicated. This image is depicting my Sim's family tree.
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