"live pair" means: Two members of Congress who would have otherwise cast opposing votes, but who form an agreement whereby one announces the couple is a live p.... This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.