Re: How Do I Tame an Inherited a Cat.
I think it is wonderful that you have taken in this family of cats to help better their lives, however it appears if you don't take steps now, you may wind up with cats who have life-long problems.
Number one on the agenda, is to spay/neuter everybody.
First, I think the Mamma-cat is perhaps a little confused about why her kittens enjoy spending time with the humans AND her kittens are approaching the age where she would be weaning them and sending them out on their own so she could protect *her* resources (food, shelter, territory) and begin raising her next litter. It is instinct telling her to do this.
Next, as for the kittens, I think if they were mine and all came from the same litter I would confine all three of them together in a small room with only one hiding place and work on handling and socializing all of them. Making certain Creampuff was handled daily and regularly so he would progress at least near the same rate as his siblings.
Finally, the mamma-cat can be handled and socialized in the same manner, however there are certain steps that need to be taken with her in progressing her through a handling and socialization program that both help the adult cat and keep the handler safe and unharmed.
The only thing I can guarantee, is if you do not work on socializing these animals they will probably remain as they are and not make forward progress on their own.
Best of luck to you and these lucky kitties,