[1][2] He was the son of Thamotharampillai, a village headman from Mullaitivu in northern Ceylon.

[1] Sivasithamparam stood as an independent candidate in Vavuniya at the March 1960 parliamentary election.

[4] He later joined the All Ceylon Tamil Congress (ACTC), serving as its youth leader.

[6] He was however defeated by the Illankai Tamil Arasu Kachchi (ITAK) candidate X. M. Sellathambu at the 1970 parliamentary election.

[12] Sivasithamparam and all other TULF MPs boycotted Parliament from the middle of 1983 for a number of reasons: they were under pressure from Sri Lankan Tamil militants not to stay in Parliament beyond their normal six-year term; the Sixth Amendment to the Constitution of Sri Lanka required them to swear an oath unconditionally renouncing support for a separate state; and the Black July riots in which up to 3,000 Tamils were murdered by Sinhalese mobs.