The garage and bathroom don't share a breaker. Every room on the west side of the house along the back of the house share a breaker, being the back family room, kitchen, bathroom, and my room. These rooms are all on a 20 amp breaker. the bathroom actually doesn't even have a GFI. I only have GFI because I put one in in my room and that is the only GFI in the whole house even. The garage is on its own circuit for 110v, and the garage is were a separate panel is for the 220 for the laundry which is on the back patio. The electrician installed another panel in the garage just below the panel for the laundry. I re routed that wiring from the second panel into my room. Even the hot tub that never worked right didn't have any GFI. Or rather it did but it was funky wiring. The thing never heated up, we bought it used and got scammed.
Or are you back to the OP, I'm confused. Again, I didn't read every post so I'm confused.