To what did the parliament member swore her oath to, whose son is Lohan Ratwatte?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/child> <http://dbpedia.org/resource/Lohan_Ratwatte> . ?x <http://dbpedia.org/property/allegiance> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/MemberOfParliament>}
Lohan_Ratwatte