Jake Reiner, the older son of Rob and Michele Reiner, says learning his parents were killed and living in the aftermath has been “too devastating to comprehend.” In a post on Substack on Friday, Jake Reiner shares his sweetest memories of the beloved Hollywood director and the photographer and philanthropist who was his wife for 36 years. And he describes the horror of losing them when they were stabbed to death on Dec. 14 in the Los Angeles home he grew up in. It is his first detailed public account of his experience. He had previously only issued brief joint statements with his sister. “Nothing can prepare you for what it feels like to lose both parents instantly at the same time,” Jake Reiner writes. “It’s too devastating to comprehend. I still wake up every morning having to convince myself that, no, it’s not a dream.…