It sounds like the drain needs to be snaked out to remove a partial blockage. This is usually the owner's responsibility to have done, not the renter.

Agree with Randy.

It is possible a previous renter had a child that put something they shouldn't have down the trap. And, your brother's problem, or not, may have just brought this more to light... like a plunging may have changed the position of the stuck object (turning it) in such a way as to block the plumbing more.

A plumber (called into play by the owner/manager) would be able to remove the object (maybe with a snake, or maybe by removing the toilet and inspecting drain, etc...)

Okay. Thank you for your information. I was able to get the toilet to flush while I was cleaning the kitchen that night. Somehow when I used the garbage disposal my brother said he heard the toilet making noises and he tried flushing it and it was back to normal. Currently, both toilets now make a gargling noise whenever someone uses either shower. The plumbing of this house has me concerned, but hopefully it's nothing to major. We will contact the management company see that this issue is resolved. Thank you again for all of your information.

I can only offer a little practical advice for preventing future problems: get some moist wipes. They are surprisingly efficient and the volume of paper good you need to flush should be significantly less. Plus it's much more comfortable than many dry swipes!

Moist wipes have to be the worst invention for the sewer and plumbing systems ever invented! I've had several friends with costly plumber's bills after using those. Be forewarned. (they don't disintegrate like paper and really clog things up).

A gurgling sound downstream is indicative of a partial blockage, and tree roots are the worst offenders. Said excessive use of toilet paper (and especially moist towlettes!) exacerbates the situation.

Depending upon the age of the house, you may have cast iron pipe or PVC drain lines. Though PVC is much less susceptible to root invasion, it still can happen.

Whenever I hear the tub making noise, I know it's time to snake the main drain - and they ain't even my trees....

Gurgling sounds often indicate blocked vents. A backed-up drain can push debris into the vent and since the vent has no water flow through it, the debris may remain and inhibit movement of air through the vent. Vents (and drains) can be snaked from the roof. But it is not fun.