"kinsman of" is correct and can be used in written English.
It is typically used to indicate a familial relationship or connection. Example: "John, the kinsman of Sarah, was present at the family gathering." In this example, "kinsman of" is used to indicate that John is related to Sarah by blood or by marriage.
The police chief is a kinsman of Fazal Nabi, the strongman who took Shakila, he said.
For two decades the southern rebels' leader was a Dinka, John Garang, a kinsman of the bishop.
A kinsman of Robert the Bruce, who had no male descendants, is Conservative prospective parliamentary candidate for the Liberal Democrat-held seat of Fife North East.
A kinsman of Sir Francis Drake, Hawkins began his career as a merchant in the African trade and soon became the first English slave trader.
Suzannah Louise Shogren, the daughter of Cynthia Hawkins Shogren and Tony M. Shogren of Hobe Sound, Fla., was married yesterday to Julian Haber Kinsman, the son of Rowena E. H. Kinsman of Withybrook, England, and David J. J. Kinsman of Windermere, England.
There are flavors of Welles and Fellini here, and our hero — with his hat, his shaded spectacles, his sudden outbursts, and his toothy grin — could be a kinsman of Jean-Paul Belmondo's.
The Azerbaijans are Turkic Muslims--kinsmen of the people who massacred Armenians in Turkey at the turn of the century.
Mr. Erdimi's faction is made up largely of disgruntled kinsmen of Mr. Déby's Zaghawa ethnic group.
The fact that many of the captured scribes were kinsmen of the conquered king and suspected of continued loyalty might have contributed to their fate.
In the state of Jin the influence of kinsmen of the ruling house had been trimmed even before Wengong established his overlordship.
By the nineteen-forties, a group of churchmen had emerged who were the theological kinsmen of the fundamentalists but who were embarrassed by the movement's excesses.
