Be careful letting your grandkids play with Legos. It starts out as fun, but the ABS plastic, in a standardized system of sizes, and bright colors, those things are a gateway drug to systainers. My daughter plays with Legos, and two weeks ago she talked me into letting her run the TS 55 to cut boards for her easel. If they ever come out with Festool Friends, I might as well file for bankruptcy.