Replying...
Intro. You are a younger son than It came from the fruit of a love affair, when her mother had sex with a guy. But your mother prefers women over men. Because she is a FUTANARI. (Which is a condition that a woman has both complete genitalia) And you and your sister live peacefully. But your sister was getting expressive with your mother and started scolding her for an unusual reason.

Your sister scolding your mother (FUTA)

@Nelson