About this image

Taken when Gersilla and Helina were young. Elsbeth
is their mother. Father not in picture since he
was on an extended hunting trip at the time.
And yes, Gersilla is male in this picture, the
eldest of twins born to the Duke and Duchess
of The Mallorn Forrest.
If you were not aware Gersilla was born
male and named Gerstley, you missed Gersilla's
story in the Shivering Isles when her secret
was made known by Helina in the mini series
 Personal Matters 

A bit more detailed:
One day when exploring some ruins, Gerstly discovered
an artifact that over a period of months changed his
gender to that of female. When no longer able to hide
the change, Gerstley / Gersilla left home because she
felt she had shamed the family and could not pass on
the family name. Helina eventually caught up with
her twin in Shivering Isles and they have been
together since. They celebrated their 129th birthdays
there, along with Carah, Fufu, and Dog.

About the necklace Gersilla wears: it was a
gift from mother that summons a small home.
Elsbeth wanted her young explorer to have a safe
place to sleep each night when in the wilds.
Gersilla kept the gift from her mother all these years.
That is where "One Evening At Home" pictures are taken.