Hosting for the Holidays Left Me Messed Up

My husband (M50s) and I (M30s) host a lot of holidays at our house. We have a huge house, it's not located perfectly for all my family, but we have 4 guest rooms, and I was planning on putting a bunk house or two on the back of the property eventually. I love hosting holidays at my place. It's huge. Each floor is about 2400 sq feet and the main floor is mainly open except for my husbands office. We've had about 60 people over for dinner before and there was plenty of room. I built my house for this. It has 3 kitchens! It is made for entertaining.

My husband and I are childless and I love having our huge house. We have a nephew who lives with us part time, because he was in a toxic environment with his parents, and I gladly have him here. I want my house to be a safe space for him, since he didn't have that growing up, and I didn't either, so I know the struggle of living somewhere you don't feel safe.

Here's the issue. We hosted Thanksgiving, and one of my cousins stole some stuff. I caught him, and I recovered it. He took some of my husbands watches, and a necklace that belonged to my mother, and perhaps the most egregious, was he stole my nephews Nintendo Switch. The cousin who stole is fully aware of how my nephew came to live with me, and it is his cousin too.

My husband's a widower, and his first husband who he was with for 20 years was an antique dealer, so our house is full of special antiques. Some are extremely expensive and some are dirt cheap, but they hold sentimental value to my husband.

I feel so violated after that, I don't know if I want to host anymore. Looking around I realize my house is such an easy target. There are Knickknacks and stuff everywhere. I just feel so violated, and I don't know that I want a bunch of people in my house again. I just feel so shitty. I feel bad my husband was robbed and my nephew isn't as safe as I wanted him to feel.