Well, wouldn’t you know. That exact same thing happened to me. Now I have this human-looking life form, but shorter and with proportionally bigger head and eyes following me around at all times demanding to be fed.
It’s a nightmare, I tell you. 
So, your sister thinks astral planes (which have no scientific basis whatsoever) intersecting with our universe (gah! What does that even mean?) is a more feasible explaination than people simply having halucinations, or maybe just pulling a hoax?!
Where do you stand on this line of reasoning?
No, but I once had a staring contest with God while in ICU for a pulmonary embolism and on a morphine drip. Then, when I was moved back to my room, I tried to close the door from ten feet away with my reality warping tongue.
The brain’s a funny thing.
Not enough time to be probed… funny thing is, they havent discovered the multi-functional duct tape and its ever so many uses. That’s one for humans.
The fact that they only kept me long enough to travel 3.5 earth hours in an automobile avg 70mph - that would be like, what? 3.5 minutes spaceship travel? Well, anyways - I was just long enough to scare them (I didnt fit any of their “normal human” qualities) and get booted off and banned for life.
So I settled in a small college town in Kansas (where they beemed me out) and lived there while working out the rejection issues. When I finally came to a conclusion that one of me was enough, and a clone would have been a very bad idea, I moved south.
Now… on a more serious note…
I dont know anyone who has literally claimed to have been abducted - but I keep an open mind (or try to anyways) and would rather try to debunk it with evidence… kind of like ghosthunting!
And admittingly, I’d probably be more interested in details of what the ship looked like, what the aliens looked like, sounded like, smelled like, how they did this or that, etc.
You duct tape your ass?!
I’m pretty sure that I’ve been abducted by aliens though I cant remember it which is evidence in itself!
I mean something like that happens and I have amnesia about the whole thing,spooky or what ?
Obviously induced by some sort of ray far beyond earthly technology.
But I digress,in the back of my head is a small flattened spheroid that is very likely some sort of Nano engineering that monitors/directs my cerebal processes plus no doubt signals my physical status to the "Cloaked"mothership.
Well either that or its a shotgun pellet and be honest what are the chances of that in the real world?
A cunning piece of misdirection E.T. but old "Earthy"here is miles ahead of you.
Nice try aliens but no cigar.
Jay Leno (paraphrasing): “With the technology today, nothing’s sacred anymore. You can’t cheat on your wife, cops can’t beat up criminals, without someone capturing it all on their camera phone. (pause) So where are all the UFO pictures?”