Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

Ground residential delivery to every day of the week; integrating smart post package volume into the Ground network; investing in technologies that enable real-time decisions and optimize virtually all aspects of our operation; building our network’s capabilities to more efficiently handle and increase large items such as furniture, exercise equipment and TVs; offering the FedEx’s first FedEx branded Through The Door Service which moves larger bulker items into customers’ homes and businesses and accelerating the expansion of our retail convenience networks with Dollar General, Walgreens, and our own FedEx office locations.

Answer: parent_organization: FedEx office, FedEx; subsidiary: FedEx, FedEx office