They are so adorable. I just love kittens!
As for their positive tests: I really wouldn't be surprised if they tested negative later, as they are still young enough--as the vet as suggested--that the tests may just be picking up their mother's antibodies. That said, has the mother herself ever been tested? If the kittens picked up something from her in utero then, presumably, she will test positive for either or both disease. I would assume that her test will be conclusive.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher