About: http://webisa.webdatacommons.org/431273167

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	To answer the question you need to first look at all the equally likely combinations of two children it is possible to have: BG, GB, BB or GG. The question states that one child is a boy.
http://www.w3.org/ns/prov#wasQuotedFrom	outsidethebeltway.com