It's set out in the latest edition of Debrett (under Birkin Bt).
Alexander Kingdom (Anno) Birkin (a musician as well apparently) was
the son of Andrew Birkin by Bridget (Bee) Gilbert, the photographer
and writer. They also had another son Edmund (Ned) Xavier Birkin, born
in 1985. David Tristan Birkin is the son of Andrew Birkin by Lisa
Guss. Bee Gilbert had previously had two children by the actor Sir Ian
Holm - but not as one of his 4 wives!
On Sep 5, 5:28 pm, Shinjinee <
ssen_ro...@yahoo.com> wrote:
> According to Wikipedia, David Tristan Birkin (b 1977), son of Andrew
> Birkin, grandson of Judy Campbell [actress, stage name], and nephew of
> Jane Birkin, is engaged to be married to the performance artist,
> Eloise Fornieles. His half-brother was the poet Anno Birkin
> (1980-2001). However, this is not corroborated by other sources.
> Please confirm!
>
> Source:
> 1.
http://en.wikipedia.org/wiki/David_Birkin