“I used to get extra help from my science teacher after school. I would talk to him about my problems, and I learned more from him than just science. He was a real father figure for me.”
A father figure is a man who is not your father (including other male relatives), but fills a similar role in your life. A woman who is not your mother can also be a mother figure.
「僕は放課後、科学の先生に特別に教えてもらってたんだ。勉強に関係ない悩み事なんかも相談して、先生からたくさんの事を学んだよ。先生は父親みたいな存在だったんだ。」
「Father figure」は父親(又は男性の身内)ではないけれど、父親のような役割を果たしてくれる男性です。母ではない女性も同じように「mother figure」になります。