Learn Spanish (Latin America): Nuestra familia va a enterarse de todo. - Our family is going to find out about everything.

This is exactly what governed prepositions are all about! The verb enterarse specifically requires the preposition de to mean "to find out about" or "to get the news". While sobre usually translates to "about", you can't use it here because enterarse comes as a package deal with de.

Since "our family" includes us, why is the pronoun se at the end of enterarse instead of nos?

Even though a family has multiple people in it, the noun familia itself is grammatically singular (like "it" or "she"). Because the subject is a singular third-person noun, we must use the third-person pronoun se. If the subject were "we" (nosotros), it would be vamos a enterarnos.

Could I put the se somewhere else in this sentence?

Yes, you have two options! When you have a conjugated verb followed by an infinitive (like va a enterar), the pronoun can either attach to the end of the infinitive to make va a enterarse, or it can jump to the very front before the conjugated verb to make se va a enterar. Both are completely correct and common.

What is the difference between using enterarse de and a verb like saber?