This document can be found within Advil Gwiberskarn's possession.
The known Gwiberskarn family-tree, following direct descent of the Patriarchs and Matriarchs, to the generation of Irad Gwiberskarn II, sixth Patriarch.
Underneath the first line is Irad's sketch of the family crest, two diamonds crossed at different angles in orange with a black outline, with the head of a Gwiber of Enedwaith drawn in the centre.
[Irad I, Patriarch, Irad Brenin]---------[Asil I]
Parents of:
[Skelcar I], [Skelcar II], [Jazilin I]
[Skelcar I, Patriarch]---------[Unknown]
Parents of:
[Narvulcarb The Terrible], [Trixtus I]
[Trixtus I, Patriarch]----------[Fascrel]
Parents of:
[Asil II], [Skelcar III]
[Asil II, Matriarch]---------[Nelson Sharpthistle]
Parents of:
[Skelcar IV], [Asil III], [Lord Wyvon]
[Skelcar IV, Patriarch]-----------[Calir], [Avel]
Parents of:
[Irad II]--Twinned with--[Advil I], [Fascrel I], [Cascrel]
[Irad II, Patriarch]-------------[Gwynara of Methedras]
Parents of:
[Jazilin II], [Skelcar V], [Advil II]
I report that, at the time of writing this, those who remain are, in order of age:
Lord Wyvon, Irad II, Advil I, Cascrel, Jazilin II, Atticus and Skelcar V.
Those alive, not within the descent of the Patriarchs are, again in order of age:

