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The short answer is "Not a lot". We know relatively little about the life and character of William Adelin (or William "the Atheling").
The main chronicles for the period are:
There are also a number of other chronicles that mention particular events (such as the wreck of the White Ship) peripherally.
So just what do we know about William Adelin?
Given the implications of the death of the heir to the throne of England in the wreck of the White ship, it is perhaps not surprising that this is the event of William Adelin's life for which we have most information. This single event would lead to the two decades of civil war known as The Anarchy. Yet, even so, many of the details of his death in the wreck of the White Ship are uncertain.
So, even if the details in the chronicles were honestly and accurately recorded, it was just the testimony of one (or, at most, two) survivors.
[Some chroniclers (notably Henry of Huntingdon and William of Nangis) suggested that the White Ship sank "because all [the men] aboard were sodomites". This was, presumably, simply a reflection of the medieval belief that disaster was an act of God, and always the result of sin. That said, Henry was often quick to assume the worst about people - it's probably one of the reasons that his books were so popular!]
It's not much of a record of a life, but, then again, William Adelin was just 17 years old when he died. He never ascended to the throne, and lived his life in the shadow of his father.
For context, it is worth noting that Henry of Huntingdon's chronicle was first published, under the patronage of Alexander of Lincoln, in around 1129/1130. A second edition was published in 1135, with further editions following over the years, up to 1154. His writing style made his works popular (we have at least 25 surviving manuscripts from the period). Then, as now, (albeit to a slightly lesser extent, perhaps) a whiff of scandal sells!
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He also attested several charters and seems to have been in training as a co-regent along with his mother between 1116 and Matilda's death in 1118.