Just to be sure: Planet with multiple moons

It is said that even Hal Clement effed up once, so I feel I ought to ask 
in here, just to be sure:

If a planet has multiple moons, all large enough to be visible, as 
discs, from the surface (through the atmosphere), i.e. unlike the moons 
of Mars, will they all be in the same phase at the same time, i.e. full, 
waning, new, waxing?

If not, how does it work. Is there some kind of essay I can read, or a 
brief educational animation I can watch, or something?

-- 
Peter Knutsen
sagatafl.org