Son – hijo
(Pronounced ee-hoh)
To remember that son is pronounced ee-hoh (hijo) in Spanish, use the following mnemonic:
He had a way of dealing with his naughty son – he hosed (hijo) him down.

Hijo is masculine, so it's el hijo. Imagine someone's son invites a friend home – and it turns out to be an elephant!

NOTE: There's a feminine equivalent of hijo – hija (pronounced ee-hah), which means daughter. So if you're talking or writing about a daughter rather than a son, use la hija.
Examples of hijo (son) in a sentence
Mi hijo estudia mucho en la universidad.
(My son studies a lot at the university.)
El hijo de María es muy simpático.
(María's son is very nice.)
Tengo un hijo y una hija.
(I have a son and a daughter.)