From the time Thanos is born on Titan till the time he first flees Titan.
It'd be interesting to know what time they keep on Titan, but here we'll use standard earth time.
Year 0 Age 0
Thanos is born brain damaged, as the umbilical cord that wrapped around his neck, as he was born, deprives his brain of the oxygen that it needed to be normal.
Thanos is born inheriting his mother's insanity. And that is something I know about. For on my mother's mother's mother's side of the family, we can trace back insanity in the family for more than 160 years.
1st Female Betrayal
His mother tries to kill him.
He is then saved by his father, who then seemingly washes his hands of him.
Both events Thanos remembers.
Year 1 Age 1
Eros, Thanos' younger brother, is born one year to the day after Thanos is born.
2nd Female Betrayal
Eros quickly becomes his mother's favorite, which Thanos remembers.
Year 2-6 Age 2-6
Thanos is educated at home like most of the children of the elite.
Next time: timeline continues