Ah, found one.
Alexis Aleksandrovich, son of Alexander II, to his father's widow about the behavior of her son (his half-brother), Prince George Yurevsky (Gogo), in the Navy.
Saturday, December 24, 1893 [Jan. 5, 1894]
St. Petersburg
Dear Princess, as I have already cabled you, I granted leave to Gogo [George], but only for your sake. He himself, of course, has not earned it, and unfortunately I must again repeat that I am extremely dissatisfied with his services.Both when on duty and on board during cruises he simply does not want to do anything at all; neither advice, nor the example of others have any effect whatever on him. Laziness, untidiness, and total lack of self esteem make him the laughing stock of his comrades and draw upon him the dissatisfaction of his superiors, who do not know what to do with him. Today I gave him a severe reprimand, and have ordered his superior, that is the Commander of the Ship, to punish him severely for every misdemeanor! Perhaps that will have some effect. I am writing you all this, because I am afraid that Gogo will hide the truth from you, all the more as he is past-master at inventing excuses and talking himself out of trouble. It seems to me he would do better to transfer to land service, for he will never make a good sailor! It is very unpleasant for me to have to write you all this, but what can I do. I send you my best wishes for the New Year, and trust that you and the children are well.
Heartily yours,
Alexis