His son , Solomon West Ridgeway Dias Bandaranaike , became the 4th Prime Minister of Ceylon after independence .
His granddaughter , Chandrika Kumaratunga , became both Prime Minister and President of Sri Lanka .
His son , Solomon West Ridgeway Dias Bandaranaike , became the 4th Prime Minister of Ceylon after independence , and his granddaughter , Chandrika Kumaratunga , became both Prime Minister and President of Sri Lanka .