Her brother was born on September 13th 2014.
Debrett's Peerage and Baronetage 2018 Vol.I. p.1175
Debrett's don't record her births
Her aunt the Hon. Louisa Ticknor Beaumont Sinclair and her husband Jason Bauman had a daughter : Sophie Ticknor Beaumont (2008) and à son : Henry George Sinclair (2011).
Debrett's Peerage and Baronetage 2018 Vol.I p.1175
Thank you in advance,
Isabelle.