Some Americans are moving their loved ones to Mexico, where an assisted living facility is cheaper.Westend61/Getty ImagesIt costs about $10,000 a month to care for Richard Johnson, an 85-year-old living in a New Jersey dementia facility for long-term care. It's a price tag his daughter, Rebecca, doesn't think he can sustain."It's just brutal," Rebecca, a 56-year-old New Yorker, told Business Insider.Rebecca anticipates that her dad, who's otherw…