Human development

Title
Younger brother - Older brother
Older brother - Younger brother
Elder sister - Younger brother
Younger brother - Elder sister
Brother - Brother
Sister - Brother
Brother - Sister
Girlfriend - Boyfriend
Boyfriend - Girlfriend
Girl - Boy
Boy - Girl
Boss - Worker
Secretary - Boss
Boss - Secretary
Worker - Boss
Lender - Borrower
Borrower - Lender
Blackmailer - Victim
Victim - Blackmailer
Witch - Bewitched
Bewitched - Witch
Comforter - Berieved
Berieved - Comforter
Donor - Beneficiary
Beneficiary - Donor