Are birds reptiles???

The short answer is, what do you define by the word "reptile".   Taxonomical class Reptilia, as it stands now, would have to include birds.   Maybe the whole organization needs to be redone.  So there is a superclass that includes what we now think of as Avians & Reptilians.  This is above my paygrade, lol!  But they are certainly more closely related than was commonly accepted.