I remember hearing (don't know if this is true or not) that there are some other, obscure (*very* small) Catholic sects that allow clergy to marry (e.g. Ukranian), but are still part of the Catholic Church. Does anyone know if there is any truth to this? I was brought up in the RCC, but I was told that it was only the Roman sect that demanded celibacy of clergy (though it is by far the vast majority).
they aren't "sects", they're different rites. Different terminology can mean different things.