'Hijo de tu mamá" literally means "Son of your mother" (which is your brother).
This is often used though to mean "Son of a gun" (as opposed to saying the cruder version of that phrase).
"Quién es el hijo de tu abuelo" is Spanish for "Who is the son of your grandfather?"
That means, "He is your aunt's son." Sounds like an answer to "What is a cousin."
This phrase translates to "What is the nickname of your youngest son?" in English.
It's a bit grammatically confused. Assuming the writer meant: 'el hijo de tu nueva esposa' = 'your new wife's son'
you son, your son.
the son of your mother and your stepfather
De tu means: of your in English.
It means', "What's your smallest son's nickname?"
You are the daughter or son of your mother?
What's your elder son's nickname
I am your father, my son. Mijo is a contraction for mi hijo, which means my son.
Your son/child in this life and the next