He married in 1881, Margaret Rees of Caerwiga Pendoylan, Glamorgan.
His Welsh Nationalism dominated his early profile in parliament and he wrote a number of publications; Wales, its notable Sons and Daughters; St. David's Day Addresses Delivered Before the Cleveland and Durham Welsh National Society, 1905–1910 [1911], Home Rule for Wales; Addresses to "young Wales" [1912], Cymru a'r Gymraeg.
[1] In 1914 his pacifism took centre stage as he opposed Britain's entry into World War One.
Along with a number of other pacifist Liberal and Labour MPs he joined the pressure group the Union of Democratic Control in 1914.
He had joined the Labour Party and had their endorsement but did not receive endorsement from the Coalition Government and was defeated by a Liberal who did; He again stood as a Labour candidate for parliament at the 1922 General Election but this time in Brecon and Radnorshire; He did not contest the General Election of 1923 when Jenkins was returned unopposed, but he contested the 1924 General Election and finished third; He did not stand for parliament again.