Spater Senanayake had made his fortune in graphite mining and at the time he was expanding into plantations and investments in the arrack renting franchise, later he would be awarded the title of Mudaliyar for his philanthropy.
[7] An active social worker, F. R. Senanayake was elected to the Colombo Municipal Council from the Colpetty Ward in 1912.
[7] When World War I broke out in 1914, the Senanayake brothers joined the Colombo Town Guard.
He formed the Lanka Mahajana Sabha and assisted in the formation of the Young Men's Buddhist Association.
He was a strong supporter of his brother D. S. Senanayake being elected unopposed to the Legislative Council from Negombo in 1924.
He was on a pilgrimage to Gaya when he became ill. A statue of F. R. Senanayake has been erected in the Viharamahadevi Park facing the Colombo Town Hall.
[8] He married Ellen Attygalle, the youngest daughter of Mudaliyar Don Charles Gemoris Attygalle and they had six children; Richard Gotabhaya, Fredrick Tissa, Phyllis Nedra "Girlie", Swarna Neela, Chandra Upali, Rupawathi.
His eldest son Richard Gotabhaya Senanayake went on to become a member of parliament and a Cabinet minister.