Are calico cats dangerous?

am trying to rescue a calico cat i found her in my cousins back yard and she has two black and white kittens i want the mom and her kids i don't have every thing ready yet but i will,i have time in tell she worms up to me and i was just wondering she is a stray how hard is it to tame her and her kids are 3-4 weeks old they will get use to every thing right? and are they active cats or sleepy heads please help me ....................................than… you