Walter was born in Linsfort, Buncrana. His father John was an RIC constable. His mother was Catherine Jane, surname possibly Ovens. Other possible siblings are Robert b1869 and William b1872.
I'll warn you now, this name is all over the place, for example there are various permutations of Curry / Currie / Corry / Carey and Moutray / Montray / Mountray / Moutrey.