Yes, Lissadell was the childhood home of Constance and her even more interesting sister, Eva - described by Wiki as
Irish poet, theologian, and dramatist, and a committed suffragist, social worker and labour activist
and that's a pretty good definition of 'interesting'.
Constance and Eva were the 'two girls in silk kimonos' in the Yeats lines:
The light of evening, Lissadell,
Great windows open to the south,
Two girls in silk kimonos, both
Beautiful, one a gazelle.
I think Con was the 'gazelle', Yeats probably fancied her more than Eva.
Still, nice piece of diplomacy there: 'both beautiful...' Fair play to ya Willie