Robert Armstrong-Jones the Welsh physician was what relation to Antony Armstrong-Jones, 1st Earl of Snowdon?
Robert Armstrong-Jones:  He was the grandfather of Antony Armstrong-Jones, 1st Earl of Snowdon (d. 2017). Antony Armstrong-Jones, 1st Earl of Snowdon: Antony Charles Robert Armstrong-Jones, 1st Earl of Snowdon, (7 March 1930 – 13 January 2017), commonly known as Lord Snowdon, was a British photographer and film maker.
i don't know