What about a father in his eighties and an aunt in his seventies?

My father is ten years older than my aunt. My father told me that my aunt had followed him since childhood. When I grow up, my aunt goes to school and my father helps her. My aunt's marriage was also guarded by my father. I really should say "big brother is like a father". After earning money, my aunt always brings gifts to my father. Before going home, she always asks my father what he wants to eat and what he needs. Their brotherhood has also witnessed the fact that "brothers and sisters are like brothers".