"Hi, this morning I cleaned up a mess in my basement caused by a water
leak.
Most of the water was on the floor of the bathroom and surrounding
areas,"

Hell I'm totally lost.

How could a leaking T&P on the basement water heater cause water on
the above bathroom floor?

Isn't the water heater in question (a Whirlpool water heater that was
installed 3 - 4 years ago.)
I would assume that may be an inline heater.

After all this it may be a loose toilet tank that leaks when the big
bodied wife tinkles durring the middle of the night.

kenny b