That's what I thought I did. How do I go about playing a previous save? I press the play key like always, then I go to whatever world/lot I want to play. I never noticed I could play a previous unsaved game? I exited out as soon as he was lifted up, turned off the game, restarted and went back to that location that showed everything automatically saved (as you mentioned).
Now this is the problem. The family are vampires, they are not in any profession, they all have no jobs and only go out to restaurants to mingle. All they do is hang out with each other all day and their girlfriends. I avoid even talking to the aliens at these bars but not be mean, just say hi every now and then. I have never examined them or participated in anything that would involve aliens in Sims 4, it never was an interest in this version in my opinion.
That night, one of them came to the house and knocked and I was like "shhh don't answer the door, we're not here" (like real life). She turned around and left, they were celebrating him just getting engaged. Suddenly they both went to fly upstairs then a beam comes down from the sky (behind the house close to where they were) the alien disc shows in the air, he becomes human and it pulls him up to the sky and it took off. He was alarmingly gone what seemed forever (compared to Sims 2). They picked him up around 8pm.
Right before light, he was returned. So you see, I do not understand why he was abducted inside his home as he turned into a bat. I even have recorded footage. I fast forwarded his life through the entire pregnancy and got rid of it, couldn't get rid of it fast enough. I want to take revenge and kill all the aliens with my vampire powers but something tells me, they will reverse it and kill them. Since I never even initiated any contact I'm wondering why this happened in my game. It makes no sense.