How old are they?  Best time to bond is about 4 weeks to 12/16 weeks of age,
although they can still be won over then.  Food is a great motivator.  Sit
in a small area with them and let them get used to your scent.  They may
decide to climb all over you or curl up in your lap if you can sit long
enough.  If they are still nursing, and if mom will let you, pet her and the
babies both while they are nursing.  If they are eating on their own you can
try to pet them as they eat.  Offering them tasty food from your hand is
another way to entice them.  I use meat baby sticks and cut into small bite
size pieces, then feed it to them from my hand.  This has worked for me in
the past.

Good luck

just take time and  bring them food  and let them come to you