Lots of good ideas above. People will need some clues. Is Raymond retired? Do either he or his wife have a part time job? Have you tried Facebook for any other family? Surely the younger generation will use it.
Have you visited in the past? Do you remember anything eg clues to beach or a pub or was it near Carrefour hyper market? Anything at all that may provide a clue. Did they live in a house or apartment? Was it in Torrevieja or the outskirts? Get your thinking cap on and tell us!