The 3 single guys appear to be made of plaster and I believe that mom and baby are made of resin.
The tallest single guy is 2 7/8" tall, the little guy beside him is 2" tall, the chubby one also comes in at 2" tall and mom and baby measure 2 1/2" tall.
I could not see damage on any of them.
Asking $20 for the 4.
Reasonable offers are always welcome and will be considered.