After her boyfriend invited himself and his brat daughter on this mother's holiday with her sons, they could not have been on worse behavior. After putting up with the daughter's entitled behavior for most of the trip, the mother snapped and sent them packing, leaving them at a car rental agency and telling them to find their way home. The altercation between the couple occurred after a series of infuriating events enabled by the boyfriend, Dave, a 44-year-old male and perpetrated by his 17-yea…