He couldn't stop the tears once they really started. "I'm sorry. I'm... I wish I could tell you something different." Sam managed to say, he could feel his breath coming in shaky gasps, and he was trying not to panic. IIt was hard.
"Cas, he.. He gave up his life for Jack. Jack is Nephilim, Lucifer got a human pregnant." Sam wasn't sure how much Claire knew. "Jack ended up killing.. He killed Mary." Sam said, he knew Claire would see that for what it was. "Even though Dean and I don't consider her family, she was still our mom." Sam had hated that look on Dean's face. And that had caused a rift with Dean and Cas for a while, too.
It was a full minute before Sam could speak again. "So in the end, it wasn't even worth it!"