What going to happened if we receive a subpoena and both of us don't show up to the court.

It all depends on what you are being subpoenaed for.

For some, you are held in contempt, a warrant is issued and you are taken before the court.

More detail is needed to tell you about yours,

Where is it at, what is it for?

A subpoena is a summons to appear in court. Failure to answer a subpoena is considered contempt of court and could result in a warrant being issued for your arrest.