OK, in the absence of any wisdom, here goes. This is in answer to John's question about the Anu.
We start off with the Indian flood myth. In the Rig-veda (10.63.1) Manu is the first ancestor. Manu and his family were survivors of the world flood, as mentioned in the Shatapatha Brahmana (1.8.1).
Thus, according to this mythology, we are all descended from Manu. This doesn’t, imo, mean that they're implying we're all Indian. I think that these mythological stories were passed on orally long before the composers of the Vedas ever came into India more than 10,000 years ago.
Manu’s important descendants are the Pauravas, Ayu, Nahusha and the great patriarch, Yayati.
Yayati is the father of the five sons – Anu, Puru, Druhyu, Turvashu and Yadu.
Those five sons are the forefathers of the five main tribes – some of this will be contentious, so please remember (before you let loose on me!

) that I’m just recounting what’s in the mythology and the Indian interpretation of it:
• the Puru tribe, connected with the Yamuna and Ganges region. The Rig-vedic people who developed Vedic culture in north central India and the Punjab along the river Saraswati. They eventually became the Paurava dynasty are thought to be the ancestors of the Egyptian Pharoahs.
• the Anu tribe, related to the north, to Punjab, as well as Bengal and Bihar. Mainly southern Kashmir along the Parushni (modern day Ravi) river (Rig-veda 7.18.13) and spread over western Asia developing the various Iranian cultures. (This is the same river Ravi where Sudas, a Puru, fought the ten Anu kings).
• the Druhyu tribe, related to the west and northwest, such as Ghandara (present day Kandahar) and Afghanistan. They are believed to have spread across Europe as the Druids or the Celts. A first group is said to have travelled north-west and developed the proto-Germanic dialect, and another group migrated further south and developed the proto-Hellenic and Italic-Celtic dialects.
• the Turvashas tribe, related to Bengal, Bihar and Orissa and are the ancestors of the Dravidians and the Yavanas. The Indians believe that the Turks came from the Turvashu tribe and that some of the Yavanas became the Hebrews.
• the Yadu tribe – related to Gujarat and Rajasthan, from Mathura to Dwaraka and Somnath. Became known as the Lunar dynasty (also known as Yadavas, the tribe of Krishna.)
The genealogy following Yayati is in the later Vedantic literature, the Srimad Bhagavathan. The dating of the SB is, as usual, controversial - the latest dates being 9th to 10th centuries CE, and the earliest relying on the fact that the SB (as well as its contemporary Ramayana) mentions four-tusked elephants – these became extinct after the Pliocene.
So on to the SB’s family tree of Anu. This is from Canto 9:
The sons of Yayäti’s fourth son, Anu, were Sabhänara, Caksu and Paresnu. Of these three, the sons and grandsons of Sabhänara were, in succession, Kälanara, Srnjaya, Janamejaya, Mahäsäla and Mahämanä. The sons of Mahämanä were Usinara and Titiksu. Usinara had four sons, namely Sibi, Vara, Krmi and Daksa. Sibi also had four sons—Vrsadarbha, Sudhira, Madra and Kekaya. The son of Titiksu was Rusadratha, who begot a son named Homa. From Homa came Sutapä and from Sutapä, Bali. In this way the dynasty continued.
Begotten by Dirghatamä in the womb of the wife of Bali were Anga, Vanga, Kalinga, Suhma, Pundra and Odra, all of whom became kings. From Anga came Khalapäna, whose dynasty included Diviratha, Dharmaratha and Citraratha, also called Romapäda, one after another.
Mahäräja Dasaratha gave in charity one of his daughters, by the name Säntä, to his friend Romapäda because Romapäda had no sons. Romapäda accepted Säntä as his daughter, and the great sage Rsasrnga married her.
Let me know when you've digested this lot, and I'll continue.
Also, if Seeker's around, he might want to add his Iranian perspective.