My brother [younger, only brother we are adults] borrowed a grand off me the one time I could afford to lend it to him. It's been a while and he seems to be doing ok[ we are not close and I see him going on holiday, buying a camper, affording stuff on social media.] I've asked for the grand back and been told by him that I am out of order for 'demanding' the money back, been called a 'CF' and WTF he owes us [ single parent family or not, he bloody owes it and I shall continue to demand ask to be paid back. AIBU or should I STFU and fund DBs pub lunches, holidays, weddings etc?