with his/her/their mother
He lives with his mother.
Pero siempre vuelve a casa con su madre.
But he always returns home to his mother.
El niño tiene un gran parecido con su madre.
The child bears a strong resemblance to his mother.
Tom todavía vive con su madre.
Tom still lives with his mother.
Siento mucho lo que ha ocurrido con su madre.
I'm so sorry about what happened to your mother.
— Legado en los huesos (2019)
He mistook me for his mother.
Pero una mujer separada, con quién va a estar mejor que con su madre.
But who could a separated woman be better off with than her mother?
— Volver (2006)
That's what he does with his mother.
Él está con su madre, ¿verdad?
He’s with his mother, right?
Tom habla en francés con su padre y en inglés con su madre.
Tom speaks French with his father and English with his mother.