Can you believe someone would actually say this?

Yes, I can believe it. Although it must of been painful, it is still something that could happen.

Never discount human nature.

My family and extended family are notorious for doing things like this. I've heard of them saying things like this, and worse.

Personally, no because I come from a family where all of us siblings are equal, no matter what we have done. And trust me, one of my siblings has done some bad shit. But she's still loved as equally.
I do understand every family isn't like mine and some parents do truly prefer one child over another. It's just sad.

Yes.

On one hand, parents DO have favorite children. We all have favorites. I would be ashamed of myself, as a parent, to say it out loud but if I had children, the one that would be my favorite would be the one that I get along with the best and I bet to lose that favorite child would be a lot more painful than to lose a child that you still love and hold dear, but not as much as your favorite child.

On the other hand, I know that certain parents have children that are more intelligent or more successful than the other children and it almost seems like a waste of life for the successful child to go whilst the "useless" child lives on.

I know it sounds very harsh, but it's human nature.

Well yeah if they preferred the other offspring then why not.

In a household with multiple siblings SOMEONE is going to be the favorite. No question.

I wouldn't be surprised...

yes there are some harsh parents out there so it does happen

never belive hearsay. how do we know that sibling a was not lying? perhaps parent never said such a thing and sibling a is jsut a drama queen?

Yes. It's really horrible but there are horrible people out there.

You are dead, you just don't know it yet.

Yep, totally believable. Though, I've never known about this experience ever happening in real life.

I believe it. My mother says she hates me all the time and that I should be dead. She even sometimes says that she wish I was never here. Mind you, I was never the perfect person and my family knows that, but she still feels that way about me. My mother should never have had me because she always says I am a burden to her. Sometimes, without her even saying anything, I can feel her resentment towards me because she glares at me with this look of disgust. I suck it up and go about my business. Of course a parent can wish such things on their offspring.

I cant believe it..

This is a similar hypothetical to if you were holding each sibling by each of your hands, from falling down a cliff. And the only way to save one would be to let go of the other first, which one would you let go of?

The best answer is to continue holding both for as long as you can (in my view). Ideally until help arrived.

I don't put it past parents saying these awful things about swapping positions on a possibly dying sibling, but I do feel its wrong of the parent to say so.

By the way 'overhearing' may have been taken out of context. It could also mean the parent wanted the stronger child to have a better chance of survival in their weaker siblings place.
Therefore don't take it to heart too quickly. What's important is the time shared together whilst alive, lets not speak ill of the dead.

Who did this to you? I doubt this story is made up.

It's possible, I don't even think it's *necessarily* wrong to say that. The love between a parent and a child is far from unconditional, especially when the kid has grown up and left home.

To use an extreme example, one kid could have been a violent, abusive animal torturer and the other could have worked for an animal rescue centre. One could have been a living saint who worked saving, feeding and rearing starving African children from the beaks of vultures while the other wanted to nuke the whole goddamn continent with something called "deathfire", whatever that is. I know who I'd rather keep alive in each case, even if they were both my own flesh and blood.

Of course, some kids are assholes. And some parents are assholes.

My grandmother was a careless being. She even told her new husband that my mom was not her daughter in front of us all while dining. (Take Note: my mom is legitimate)

I can imagine that a parent may feel this way. But I don't think he/she should tell anyone. It's really not helping.

I can believe it. I imagine that if a couple had two siblings, one that was all nice and had good marks at school, and one that was so rude, wouldn't be nice to anybody and skipped all classes getting in trouble; if they asked them "somebody has to die. who do you choose?" (hypothetical, obviously this doesn't have to happen and it's super sad, but if it happened) i guess parents would say the bad one. i mean, they'd be super sad and all, but... wouldn't you prefer to keep a good one? Although I think that if it happened to me i'd be so sad. But yeah, if the "bad" kid has been So bad (done very bad things). Iunno.
He'd still be my son though :(
But some people are crazy. Some people kill their kids. So. Idk.

And no; i have never heard anybody saying this.

happy but wishing the other sibling was in the bed beside them would be worse