Setting boundaries with your parents, especially their grand parenting is brutal.
As a long distance grandpa I try very hard not to place expectations like what my parents did at times. You’ll have to ask my son (and now my daughter next year) how I’m doing.
Now that you have a bigger place expect your parents to start emptying their attic/basement/garage by bringing it over to you. Your old stuff, family heirloom stuff, and surely some pure crap. Always special when they cram it in your car when you go to visit them.