All my alien children have been that purple colour. Which is the colour that the mother appears as in the family tree.
Thanks for answering my question! Alexander is still my only male Sim that has been pollinated by Tech #3 (I play in "long" Sim lives and switch to many households throughout my neighborhood) so if he gets pollinated again I guess I am stuck with the same colored children with Alexander.
@snackrafice really nice screenshots, thanks for sharing. I think you covered a lot of questions on Aliens, all in one thread! Honestly I'm relieved that you can send the baby back to the homeworld. I've had a number of abductions myself and sometimes wouldn't want that in a game. Since they experimented on my Sim, they must want to see the results! So they can have it back. I figure if you keep it, you give them reason to keep running those tests... 
I agree, thank goodness there is an option to give the alien baby back and it disappears like nothing ever happened. With Alexander I decided to keep his alien daughter because he (and the rest of his family) are a bit strange and the alien abduction and child seemed to fit right in. But if I had a different Sim who got pollinated and it didn't quite fit with the "personal story" I had in mind for that particular Sim I am glad that I am not just stuck with the unwanted child or I would end up hassling to use cheats to delete the alien spawn from the family.
Oh! While I am writing this post there is something else that occurred a few days ago during my gameplay. I was playing the Caliente household and one of my female Sims (Don & Katrina's daughter, Valentina, to be exact) got abducted. Besides Alexander, she is the only other Sim I have had sucked up into a UFO during my Sims 4 gameplay thus far. She spent a few hours up inside the saucer and once the alien returned her back home she has this moodlet:
Abducted?!Nothing gets the blood boiling like being poked and prodded on an Alien ship.This angry moodlet lasted for four hours.
Not sure if I should assume that this moodlet (versus the one Alexander received after he was abducted) occurs only when females get abducted? I question this because Alexander worked as a scientist (previously, before the release of the GTW expansion, he worked in the astronaut career) and has skills in rocket science and logic. But my female Sim, Valentina, is very different from Alexander. She is employed as a writer (an erotic novelist to be exact, lol) and also runs a "sexy" clothing boutique. Valentina also has zero skills in logic or rocket science. Alexander has traits like "Bookworm" & "Genius" while Valentina has no traits of that type.
What I am trying to get at is maybe career, skills, and traits have some kind of influence of how your Sim reacts to getting abducted and how often they will be abducted by aliens. Any input on this from a particular Sim's experience would be greatly appreciated.
