TWINCEST - Being related to your twin sibling by means other than blood. (example: you marry someone who has a twin that marries your twin)
TWINFORMATION - Any facts of information related directly to being twins.
TWINHERITENCE - A parent dies and leaves assets to both units of a pair of twins equally.
TWINISMS - Words which are altered to reference the "Twinworld" TWINNERS - A pair of twins who win 1st and 2nd place at any competitive event.
If you know any other twinisms, please email them to me and I will get them up as soon as I can.