I agree with the last two postings. Also, coming from a rescue centre, your cats could have had terrible experiences and it will take time for them to adjust, but they will realise that you love them and that you're a permanent feature once they know you properly.
My cats are brother and sister. The brother absolutely loves being picked up and cuddled - but only by me, no one else. His sister doesn't like being picked up at all really, but she will 'allow' anybody to have her on their lap - although only when she chooses to be there. People say cats have no feelings, etc, but it's not true and they are all just as individual as we are, so some take longer than others to adjust.
I hope your cats settle in soon, good luck with everything.