Answer: a close corporation
Explanation: In simple words, a close corporation refers to a corporation the number of shareholders of which does not exceed more than the statutory limit of 35 and is not a public corporation.
In the given case, Ethan has distributed the shares of his organisation to his brother and sister. He has made provisions under no outsider will be able to have the shares of his company.
Hence from the above we can conclude that his corporation is a closed corporation.