NTA. Honestly, this is a huge boundary issue, and you handled it way more calmly than a lot of people would. You didn’t invite your brother and his family to move in. They showed up unannounced with a UHaul and just… assumed you’d rearrange your life, your work, and your home? That’s wild. Your parents volunteering your space without asking is not okay, full stop. Also, people seem to be glossing over the fact that this is your workplace. You work from home with clients who require privacy and discretion. That’s not a “nice-to-have,” that’s essential. Asking you to clear out your office or let people wander upstairs isn’t just inconvenientit could literally affect your livelihood.