Hi, these are young kitts who in a short period(allbeit for the best for them
)have had a lot of big changes in theior short lives,so give them time to check out their new environments and get used to the new smells etc,show them where their food/water and toilet is and sit back and observe,as usually the best way to make friends with a cat is ignore them and let them come to you which in time they will..not always to sit on your lap but sometimes just to say right okay you can touch me now
She is just probably a bit anxious as is he and they're picking up on each others nervousness and yours,bit of time i'm sure they'll be fine,for now keep their food bowls away from each other just til things calm down