So many people have been inspired by Michelle Obama‘s new book, Becoming, especially her older brother, Craig Robinson. After reading about their father, Fraser C. Robinson III‘s death in Michelle’s memoir, Craig decided to show his sister just how much he appreciates her by sending her a sweet message.

“As I sit listening to the words of your book for the third time, albeit this time by audiobook, it occurred to me that I haven’t thanked you for all your memories,” he said in a text message that Michelle, 55, shared via Instagram on Sunday, April 14. “Since I’m the one who is supposed to remember everything, I realized I have blocked out everything regarding dad’s death. I was here crying and laughing at the sadness of the story and the comfort of your voice all I can think of is how much I love my little sister. Thank you.”

In the caption, Michelle noted that she got the heartwarming text from Craig when she was traveling in Europe during her book tour. She called his message, “one of the best texts I’ve ever received.”

“My father gave us absolutely everything,” Michelle confessed about her late father, who she still misses today. “The laughs and lessons, the hugs, the heartache from losing him — they’re all still there with me, every minute. Each of us has our own perspectives and emotions; our own journeys in the moment and in the years since. And that’s why it’s so important to share our stories with each other — not just to remember, but to connect. Even an ocean away. Love you, big brother.”

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For National Siblings Day on Wednesday, April 10, Michelle remembered all of the great times that she used to have with Craig when they were little kids. “For as long as I can remember, my big brother Craig has always had my back,” she said via Instagram next to a throwback photo of Craig and herself as children. “He’s still one of my best friends today. Thanks for always coming out swinging for me, Craig!”