Grandparents are known for sometimes crossing the line when it comes to their grandchildren. On Reddit, a frustrated dad revealed his mom took his two boys, ages 6 and 8, to get drastic haircuts without asking him or his wife. “My wife had been letting my kids grow their hair out. It had gotten shoulder length,” he began. While his mom was recently babysitting, she took her two grandsons out to get their hair trimmed, but the barber cut their hair “very short.” “She says that she thought that we would be appreciative,” the dad continued. The frustrated man added that he and his wife are furiou…