Always Keep Your Promises
Kids do and say the dumbest things, but at least we can rely on them to get us out of sticky situations. Before the OP’s boyfriend came to visit her home and meet her parents, he told his five-year-old sister “Kimmie” to complain about wanting to go home. That would give him a reason to leave without offending anyone.
Well, as chance would have it, the boyfriend actually enjoyed spending time with his GF’s family. That’s when Kimmie actually began to beg to go home and revealed their little secret about leaving the party early. Unsurprisingly, the BF took his sister and left with a look of shame etched across his face.