I sent hair scrunchies to my DD's SIL, who I consider one of my daughters. She had complained that she couldn't find any that were satin, so I made her a bunch and she loved them. She put on Facebook: "I'm not even married and I have the best Mother-in-law in the world!" Made me laugh.
At SIL and DD's wedding, a toast was made by a groomsman, and he said, "To {bride's} parents, you are not losing a daughter, you are gaining a son."
I responded, "No, we are gaining a family!"
I truly love SIL and his entire family so, when they mention something, I like to make things for them.