Hope the plumber can fix the problem for you. Enjoy your company.

I find when my toilet is plugged, I give a good squirt of dish washing liquid into the toilet and let it stand for an hour or so. The soap helps as a lubricant. Then I fill a bucket and keep pouring the water carefully into the toilet to provide some pressure. If that doesn't do it, I repeat the process until it comes unclogged. So far, in the 21 years I've lived here, I haven't had to call a plumber for a toilet.

The tub drain is less then a foot from the toilet. Apparently, from Google research cast iron pipes hold up for 80-100 yrs, depending. My house is 70 yrs old.

And for non-toilet drain clogs, a shop-vac is my secret weapon... if you can't blow it through, suck it out.

Good luck!

Clogged removed and a strong hint to get the cast iron stack camera scoped.
Could be real, could have been an attempt at upsetting.

Phew, but now I can use my bathroom after I clean it.