By 
Lorgh
A friend of Mogh, Lorgh cared for Mogh’s son, the infant Kurn, when Mogh and his family went to Khitomer in 2345.
After Mogh was killed in the Romulan attack at Khitomer, Lorgh raised Kurn as his own son, and did not tell him of his true parentage until he reached the Age of Ascension. (Sins of the Father [TNG])
