Una Ross, 25th Baroness de Ros
Una Mary Ross, 25th Baroness de Ros of Helmsley , succeeded her mother to the title in 1943. She was the daughter of Anthony, 3rd Earl of Dartrey, and his wife, Mary, Countess of Dartrey, who held the barony in her own right.
The 25th Baroness married Arthur John Ross on 30 July 1904, and they had at least two children:
- Lieutenant Commander The Hon. Peter Ross, RN, married on 10 September 1929 to The Hon. Angela Dixon, from whom descends the current holders of the title:
- * Georgiana Maxwell, 26th Baroness de Ros
- * Hon. Rosemary Ross, married in 1973 to Beresford Osborne, and had:
- ** Joanna Elizabeth Osborne, unmarried and without issue
- The Hon. Charles Dudley Anthony Ross, married firstly on 31 August 1940 to Lady Elizabeth Jocelyn and secondly in 1953 to Mary Margaret Graham, without issue, and had by first wife:
- * Anthony Arthur Ross, married in 1969 to Joan Cahn, and had:
- ** Zara Gail Ross, married in 1994 to Stephen Mark Sanders, and had:
- ***Devon James Sanders
- ***Jadon Dean Sanders
- ***Brandon Michael Sanders
- ** Deborah Kim Ross, unmarried and had:
- ***Taylor Jade Ross
