Married Margaret Brown. He was served heir to his father James on 26 June, 1613 [1665?]. There were two sons of the marriage, Thomas and Robert.
Margaret Brown (perhaps Broun) is mentioned by M'Kerlie in a sassine as follows: "18/12/1669 Margaret Brown and Robert Lidderdale her children in fie (in succession) had principle sassine of the 10 Merksland of Torrs." In Scotland married women use their maiden names. M'Kerlie errs in saying she was Thomas's wife, she was his mother, both the writer and W.R.Lidderdale Forrest were agreed in this and so is tradition which the sassine confirms.
Source: Robert Halliday Lidderdale, An Account of the Lowland Scots Family of Lidderdale, 1950.
St. Mary's Isle appears to have been retained by the Lidderdales. On the 23rd June 1668, Robert, son of James Lidderdale, had retour of the two and a-half merk land of the Isle. In July 1668, Thomas Lidderdale of Gerantoun, son of Robert, had sasine of the land of St. Marie Ile; and on the same day Robert Lidderdale, now of St. Marie Ile, had sasine of the same.
In December  Thomas Lidderdale had sasine of the ten merk land of Torrs, etc. On the 18th of the same month and year, James Lidderdale had principal sasine of the two and a-half merk land of St. Mary's Isle. On the same date, in liferent, Margaret Brown and Robert Lidderdale, her children in fie, had principal sasine of the ten merk land of Torrs, etc. Probably she was the wife of Thomas Lidderdale, who died in February 1687.
Source: P.H. McKerlie, History of the Lands and Their Owners in Galloway, 1878.