Possible will for Robert that might mention relations in South Africa. You can view old Manx wills at LDS family history centres, at the Manx Probate Registry and in the Manx Museum or pay the Manx Museum to post or e-mail you a copy of the will:-

Name: CORKILL, Robert
Year: 1904
Parish: Ram
Ref: 158
LDS Film: 0106547