Sounds like he has a key so you need to change the locks. You've let this go on too long. Other suggestions sound useful as well.
I Refuse to Let My SIL Turn My House Into a Free Buffet

Denise simply asked her son-in-law to stop using her kitchen like a buffet, but instead, he orchestrated an over-the-top spectacle that left her utterly stunned. The situation quickly spiraled into a heated conflict, with her daughter caught squarely in the crossfire.
Hi Bright Side,
Here’s what’s been going on. My son-in-law has this knack for showing up with his three kids from his first marriage right before we’re about to eat. It’s like clockwork. Meal time rolls around, and suddenly my house is packed. And those kids? They don’t just eat—they inhale everything in sight. My fridge doesn’t stand a chance. I finally snapped and told him, “This isn’t a free buffet! I’m not running a catering service here!” He just smiled and shrugged, which only made me angrier.
The next day, I come home and immediately smell food. I walk into my kitchen, and what do I see? A whole catering crew, several strangers I’ve never met, bustling around. They’re using my pots, my pans, and my counter space like they own the place. The spread they’re preparing is for his kids, my grandson (from his marriage to my daughter), and even the adults. Before I can wrap my head around the chaos, I blurt out, “What’s going on here?”
My son-in-law steps forward from the group of caterers and announces, “I’ve arranged a full buffet to make things easier for you.” It was beyond extra, and completely passive-aggressive.
It didn’t make things easier at all—it was a nightmare. But I’ll admit, the food was delicious, and there was more than enough (I’m still eating the leftovers). When everyone left, my kitchen looked like a disaster zone. Dirty pans everywhere, sauce splattered all over the stove, sticky counters. Apparently, cleaning wasn’t part of the deal. As he walked out, he dropped the spare key on the counter, barely said a word, and left as if he’d just made some grand statement.
Now, he barely acknowledges me. My daughter is stuck in the middle, trying to smooth things over, but she looks just as exhausted as I feel. I have no idea how to fix this without either giving in completely or making things worse.
Denise
We appreciate you sharing your story, Denise. What your son-in-law did was certainly unexpected, and we’ve put together some advice that we hope will help you manage the situation while maintaining harmony and preserving your relationship with him.
Acknowledge the effort where it’s deserved.
Parenting is a challenging role, and it becomes even more difficult when you’re juggling children, work, and household responsibilities. Consider acknowledging how hard it must be for your son-in-law to manage his three kids and your granddaughter. A simple recognition of the effort he puts into family life could help ease the tension in this situation.
Offer an idea for organizing childcare.

Managing several kids at the same time can be exhausting, and it’s okay to acknowledge that it’s too much to manage on a daily basis. You’ve already put in the work of raising children, so it’s reasonable to establish boundaries now. That doesn’t reflect a lack of care; it’s simply being honest about your time and energy.
Let your son-in-law know you’re open to helping explore other childcare alternatives, such as after-school care, daycare, or even a part-time sitter. Offering to help find solutions shows your support while also respecting your own limits.
Propose sharing the cost of meals equally.
Having multiple kids over often can increase your expenses, especially for groceries. To avoid any hard feelings, consider suggesting a cooperative solution by talking about sharing the grocery costs. Gently mention that while you love having them visit, the rising food costs are becoming hard to handle. You might propose splitting the expenses with your son-in-law or ask him to cover snacks and meals for the kids during their visits.
Make bonding the priority, not just looking after the kids.
Taking care of three kids at the same time can be overwhelming, but that doesn’t mean you can’t still have fun with them. Let your son-in-law know that you’re more at ease with simpler activities, like reading, playing a game, or going on a quick outing. This way, you can enjoy their company without the stress of full-time childcare.
Put effort into mending the bond.
If there’s tension with your son-in-law, begin by making small, meaningful gestures to show you care. Invite him for coffee, do something unexpected for him, or just let him know you value his efforts with the kids. Acts of kindness will remind him that he’s important to you outside of his family duties. Once the atmosphere is more relaxed, discussing sensitive topics, like sharing grocery costs or visit schedules, will feel much easier.
For more insights on handling tricky family dynamics and setting boundaries, check out this article on managing household tensions. It’s a helpful read for anyone navigating similar challenges.
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