It is explored in Golden Sun: The Lost Age. If you have the Sand Psynergy found in Gaia Rock and the Red Handkerchief found in Southeast Angara Islet, you can get to a cow and give it the handkerchief so that it will give you the Milk, which you can then use in West Indra Islet. There's a Game Ticket buried in the far right corner of the garden patch (use your Scoop Psynergy to retrieve it). There is also a Lucky Medal hidden in a box inside the house.