Question: Who was the voice of the fictional character who was Bertram Griffin's parent?
Answer(s):
answer: Seth MacFarlane

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:fictional_universe.fictional_character.children ns:m.0c84gk . 
?c ns:tv.tv_character.appeared_in_tv_program ?y .
?y ns:tv.regular_tv_appearance.actor ?x .
?y ns:tv.regular_tv_appearance.special_performance_type ns:m.02nsjvf .
}