Ate: [In the Philippines] This is the way of how to call or address a girl (sister, cousin or friend) or woman (maybe a stranger) older than you, informal or formal.
Kuya: [In the Philippines] This is the way of how to call or address a boy (brother, cousin or friend) or man (maybe a stranger) older than you, informal or formal.
Tito: [In the Philippines] This is the way of how to call or address a man (father of your cousin or father of a friend), informal or formal.