The 2 on the left are "Storybook Dolls"...perhaps the others are too, without their clothes.
They were made of porcelain in the very early 1940's and later of some other product.
As for caring for them....keep them dust free, be

careful not to break their little fingers....and don't let anyone comb their hair! ;-)
Do they have little black shoes painted on their feet?

Each one had a name....either from a story book or another venue...history or just generic. I had a bride and a "Miss May"....and Miss August.....and a Little Bo Peep....
Very collectable....google it.

Thanks for the info Linda! MIL would have been prime doll-playing age in mid to late 1940's, but she had older sisters so some could be older. Yes, each doll has black shoes painted on, very similar among all four. All 40 fingers look intact, lol, but at least five arms are loose. The one with the veil needs an eye repair -- any ideas what kind of paint I could use? If I can't brush the hair, can I gently comb it a bit neater?

I'll google "storybook doll care", but if anyone wants to jump in with advice that would be great!

If you want to touch-up the paint for your own satisfaction, use acrylic craft paints. If you have any thoughts of selling them then do nothing. Although a touch-up here or there might make their appearance look better, it will generally devalue the doll. As close to original condition is of most importance to collectors.