the institution sells that interest to the person, that is the institution sells the whole of the major interest or undivided share it obtained to the person; and
bod y masnachwr eiddo yn prynu annedd, yr ‘hen annedd’ gan unigolyn (pa un a yw’r unigolyn hwnnw’n gweithredu ar ei ben ei hun neu gydag unigolion eraill), a