How the Triple Incarnation arises! "Thousand of years ago the great sage Bharadwaja, wishing to master all the vedas (scriptures), was advised by Indra (the ruler of the gods) to perform a yagna (Vedic ritual). Eager to have the Shakti (the consort of Lord Shiva) preside over it and receive her blessings, Bharadwaja left for Kailash (a sacred peak in the Himalayas), the abode of Shiva and Shakti, (male and female aspects fo God), to convey the invitation. Finding them coupled in the cosmic dance, Bharadwaja waited for eight days - apparently ignored by them, although he had failed to comprehend the welcoming smile cast at him by Shakti. Unhappy and disappointed, Bharadwaja decided to return home. But as he began to descend, he fell in a stroke, his left side paralyzed as a result of the cold and fatigue. Shiva then approached and cured him completely by sprinkling on him water from the Kamandalu (vessel). Consoled by Shiva, Bharadwaja was granted boons by both Shiva and Shakti, who also were pleased to attend the yagna. Shiva promised the rishi (sage) that they would both take human form and be born thrice in the Bharadwaja lineage or Gotra (religious kin group); Shiva alone at Shirdi as Shirdi Sai Baba; (Shiva and Shakti as Sathya Sai Baba), and then Shakti alone as Prema Sai." Sathya Sai Baba Revelation on 6th July 1963
PS: the third Sai ie Prema Sai Baba, will be born in Gunaparthi, a village in the Mandya district of Karnataka (previously Mysore). source: Living Divinity by Shakuntala.
Legends:
Prema means Love
Sai means Sa=Divine and Ai=Mother ie means Divine Mother
Baba means Father
All together it translates into "Loving Divine Mother Father"