Dunnington-Jefferson baronets
The Dunnington-Jefferson Baronetcy, of Thorganby Hall in the East Riding of the County of York, is a title in the Baronetage of the United Kingdom. It was created on 7 July 1958 for Lieutenant-Colonel John Dunnington-Jefferson. As of 2014 the title is held by his grandson, the third Baronet, who succeeded in that year. Dunnington-Jefferson baronets, of Thorganby Hall (1958)
Sir John Alexander Dunnington-Jefferson, 1st Baronet (1884–1979)
Sir Mervyn Stewart Dunnington-Jefferson, 2nd Baronet (1943–2014)
Sir John Alexander Dunnington-Jefferson, 3rd Baronet (born 1980)

The heir apparent is the present holder's son James Mervyn Rothwell Dunnington-Jefferson (born 2015). References

Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990. Dunnington-Jefferson