I agree that letting people know the mom cat's positive for FeLV is the best way to go. Especially with leukemia. FIV + kittens almost always will end up testing negative once mom's antibodies leave their systems, but FeLV is a whole different issue. They have been nursing off her milk which carries the virus, and she in turn has been cleaning them on the other end for weeks...closed system of viral transmission. FIV I don't think infects the breast milk (not certain though). More often than not with FeLV the kittens do end up testing positive sad to say. Good luck...and keep us posted.