Meeting Aliens

I can't answer this. I can only say that without having a scientist in the household until after the first two abductions, my advice is just have a Sim hang outside late at night. My first abduction in my Legacy Challenge game (the above mentioned game) my Gen. 2 Heir was coming home late from the bar. He'd lost his wife to a tragic grill fire while they were camping, and a friend invited him out. He got abducted. Nothing occurred. Second time around, his heir was in his tuxedo about to be wed when he got abducted. I clicked on the wedding arch and suddenly he was returned, then I about kicked myself thinking I'd just goofed it up. He and his new wife tried for baby their first night. She got preggars. Little did I know he was also in the family way. She had a girl, despite listening to Alternative music. A few short hours later, he had twins. A girl, then, thankfully a boy. I was playing a Patriarchy. It took several generations to have the lavender tint disappear, but turns out the babies are full aliens.