What is the relationship between BG Group and Royal Dutch Shell in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

333.45p -3.54% Royal Dutch Shell 'B' (RDSB) 1,599.00p -3.41% Weir Group (WEIR) 1,245.00p -3.04% BG Group (LSE: BG.L - news ) (BG.)

Answer: parent_organization