When Joshua Edward died childless in 1837 , he inherited Markree .
When his father died in 1830 , he succeeded him as manager of Markree Castle and estate on behalf of his father 's deranged older brother Joshua Edward Cooper .
When Joshua Edward Cooper   died childless in 1837 , he inherited Markree Castle .
When his father died in 1830 , he succeeded him as manager of Markree Castle and estate on behalf of his father 's deranged older brother Joshua Edward Cooper .