"My parents drink coffee."
Translation:I miei genitori bevono caffè.
When speaking about family members, it is not necessary to include the article before the possessive. Saying "miei genitori" instead of "i miei genitori" is acceptable.
It is only true for singulars (e.g. mia figlia), not for plurals (e.g. le mie figlie).
Keep in mind its still considered slang even though its common.