In the context of the input sentence, determine the relationship between 'BG Group' and 'Royal Dutch Shell'.
Options: parent organization, developer, stock exchange, publisher

It (Other OTC: ITGL - news ) would be wrong to say City investors are on the point of insurrection over Royal Dutch Shell (Xetra: R6C1.DE - news ) ’s blockbuster takeover bid for BG Group (LSE: BG.L - news ) .
parent organization