No, they are not based on the actresses, and I have plans for Minerva. Don't worry I am going to do something about her age and looks before adding her.
No it is not copied. There is some similarities at start but not entirely same.
We do not wish to leave our son in the care of any known Death Eater or the associates. Neither do we want to leave our son in the care of Albus Dumbledore as we know that he wouldn't give the proper care that our son requires. Nor do we wish our son to be ever left in the care of Petunia Dursley or her husband.