(informal, possibly dialect) one's own father / (by later extension) the head or master of an establishment such as a teahouse, boathouse, etc.

(teen girl's slang) Alternative spelling of ちゃん (chan)

(Internet slang, cutesy) Alternative spelling of ちゃん (-chan)

chance (an opportunity or possibility)

(term of endearment) mum, mommy

兄ちゃん: (familiar form for) elder brother; boy, lad, son

(familiar, term of address) (one's own) elder brother / (familiar or informal) boy; lad; chap

(familiar or childish) elder brother

お兄ちゃん: (familiar or childish) elder brother

(term of endearment) elder sister, (big) sissy