AITA for not letting my brother’s girlfriend sell my old childhood toys?

I (17m) live with my older brother (28) and his wife (29). She’s pregnant and can’t take care of her 2 kids (4f and 8m). I don’t mind but having kids around means we had to get rid of some stuff in the house. My brother’s wife immediately started getting rid of all her husband’s childhood stuff saying she’d sell them. When I tried to stop her, my brother and his wife flipped out and accused me of attacking her, calling her names and stuff. So I started recording her. She starts spitting on and kicking the stuff, calling it old useless trash.<br><br>&#x200B;<br><br>I don’t know if it’s just me, but I’ve never seen someone get this upset over old childhood toys. Also, she tried to record me too but, in my opinion, the video I recorded makes her look worse.<br><br>&#x200B;<br><br>EDIT: sorry for not responding y’all, I'm in school rn. I'm surprised so many people are so compassionate here. Most people would tell me to grow up and let it go. You guys have given me a lot to think about. Thank you so much. I'll try and update when I can.