Conversation so far:
What is Edward Plunkett's title?
Born and raised in London, to the second-oldest title in the Irish peerage
How did Edward Plunkett get this title?
The title passed to him at his father's death at a fairly young age, in 1899, and the young Lord Dunsany returned to Dunsany Castle after war duty, in 1901.
Who did Edward Plunkett, 18th Baron of Dunsany marry?
In 1903, he met Lady Beatrice Child Villiers, youngest daughter of The 7th Earl of Jersey, who was then living at Osterley Park, and they were married in 1904
When did Edward Plunkett and Lady Beatrice Child Villiers marry?
They were married in 1904
How did Lady Beatrice Child Villiers get her title?
She was the youngest daughter of The 7th Earl of Jersey
Did Edward Plunkett and Lady Beatrice Child Villiers have children?
Their only child, Randal, was born in 1906.

Question: Where did they live?
Self-contained rewrite: Where did Edward Plunkett and Lady Beatrice Child Villiers live?