Terah @ 70 yrs had Sons (Haran, Nahor & Abram) (jan 1, 2056 BC – jan 1, 1996 BC)

Description:

Here lies a 60 year window for Haran to have had sufficient years to father a daughter, Milcah who in turn married Nahor, probably born within this window as well. This would have made these two around the same age.
Lot possibly came next making him around a similar age to Abraham and then Ischar, or vice versa.
Lot could easily have been the youngest of the three making him a (few) years younger than Abram.
The text is not clear, nor is it critical.

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