Find addesses and details living and past relatives

I live in the UK where my British family was born and raised but wish to find out about past and present family members in Peru. My grandfather Charles Vigil born in London died in 1918 was the illegitimate son of Peruvian diplomat Don Benigno Gonzales Vigil who was charge D'Affaires in Brazil and later Minister in Argentina, Uruguay and Brazil in the 1800's I would like to find out date of birth, death, marriage etc. of Benigno Vigil, also about his children and their subsequent families, I would eventually like to make contact with any living relatives, they may be unaware of the Vigil family in England - it's a fascinating story to explore. I have the letters written by Benigno to my great grandmother Annie Taylor and a photo of him with his baby son Charles. Never knew my grandfather, he died when my father was 2.