@dpworkin- Not true. Blue plus blue always equals blue (or variants of; green, hazel, gray…, but never brown).
Blue eyes are recessive. Therefore if the father has blue eyes and if the gray eyes on the mother are really bluish-gray there can be no brown-eyed child from that coupling because neither parent carries the gene for brown eyes. Brown is dominant so if the gray eyes are actually brownish-gray then it certainly would be possible.
@galileogirl- They’re blue.