[3] One of her sisters, Eilis, is a newspaper columnist critical of physical force Irish republicanism; the two apparently remained estranged at the time of Siobhán's death.
[7] Some British newspapers claim she was involved in an attempted Provisional Irish Republican Army bombing in Gibraltar, prevented by the Special Air Service (SAS) in Operation Flavius.
[9] O'Hanlon was a member of the first Sinn Féin delegation to meet the British Prime Minister Tony Blair in Downing Street in December 1997.
[2][13][14] O'Hanlon also co-founded the West Belfast Festival called Feile an Phobail and devoted many years to its success, and she performed voluntary work for adults with Down's syndrome.
[16] Danny Morrison for the Daily Ireland wrote: "We shall benefit from the work Siobhán did in her life – in the freedom struggle, in the peace process, in the bridges she built, the international fraternities she established and maintained, for the goodwill she engendered towards republicanism – and for the huge political enterprises to which she contributed.