Plas Dinas
... that Lord Snowdon and Princess Margaret spent much time at his family's Welsh country mansion Plas Dinas, but after his father's death the estate went to Snowdon's younger half-brother?
... that <a href="./Antony_Armstrong-Jones,_1st_Earl_of_Snowdon" id="mwBM4" rel="mw:WikiLink" title="Antony Armstrong-Jones, 1st Earl of Snowdon">Lord Snowdon</a> and <a href="./Princess_Margaret,_Countess_of_Snowdon" id="mwBM8" rel="mw:WikiLink" title="Princess Margaret, Countess of Snowdon">Princess Margaret</a> spent much time at his family's Welsh country mansion <b id="mwBNA"><a href="./Plas_Dinas" id="mwBNE" rel="mw:WikiLink" title="Plas Dinas">Plas Dinas</a></b>, but after his father's death the estate went to Snowdon's younger half-brother?