From what material you have the sinks and the bathtubs?
 

From what materials are you sinks (bathroom, kitchen) and the bathub/bathtubs.
I have the bathbub from enameled cast iron, the sink from slate and the one from the kitchen from stainless steel.

Kohler still makes enameled cast iron bathtubs and they're still common. Sinks in older homes are sometimes cast iron too. Tubs with Jacuzzi jets are almost always plastic or fiberglass.

These days almost all bathroom sinks are porcelain, but there's decorative glass and possibly fiberglass.

Kitchen sinks are usually stainless (especially with it being a craze with appliance finish presently) but cast iron with porcelain is an option (that my parents went for since they think stainless is ugly and dumb).

Basement/laundry room sinks are usually plastic these days, in the 70s they were metal and plastic and looked like another laundry appliance, and in the 40s house I grew up in it was cement (weighed a TON) until we replaced it.

This house was built in 2005. Bathtubs are enameled steel. Kitchen sink is stainless steel. Bathroom sinks and countertops are single-piece molded cultured marble (marble dust in plastic resin) with two bowls. One of the bathroom sinks has some cracks in one bowl, that were there when I bought in 2015. I read this is common when they are repeatedly filled with very hot water.

My current house is relatively recent, so the kitchen sinks are stainless steel: one in the kitchen, and other near the "charcoal grill" (I don't remember the English name for the area where we make barbecue/steak...).
The bathroom sinks are all porcelain.
Unfortunately, no bathtubs in current house...

All cast iron in the bathroom from 1942, and the double kitchen is porcelain over steel circa 1959.