On Christmas Day, many people will be at home with loved ones. But what kind of home exactly? A “gigamansion” in the hills where you’ll have a jellyfish room but you might not bump into your guests? Or a tent on Venice Beach, with a great location but no creature comforts or stability? In 2018, more than 50,000 people were living on the streets of Los Angeles, while others were building homes of 50,000 square feet or more. DnA looks at these two extremes in “This is Home in LA: From the Tent to the Gigamansion.”