Mr. Freeze stands in the middle of a frozen over living room, recalling early portions of his life. Prior to the events of Batman Annual #1, his father left he and his mother, then a short time later, the events surrounding Victor's mother and an icy lake that we also saw in the annual happen. Freeze seems to be telling this story to an audience, as he covers Batman, and how Nora wasn't really his wife.
Some time ago, after the Birds of Prey ordeal, Freeze is once again locked up in Arkham, where someone slips him a newspaper clipping that reveals his father has a new family. Freeze's doctor speaks to him about this, and Freeze wants to contact them, and though he thinks it's a bad idea, the doctor eventually says he'll do his best to get any letters written to the family. Freeze makes sure his doctor will try hard, by threatening his life if he's lying.
Fast forward to Gotham going to shit thanks to the events of Forever Evil #1. Arkham is in chaos, and Freeze decides to see if his letters were sent. Spoiler alert: He knows they weren't, and freezes them solid to kills his doctor with.
While then going about his business, getting out of Arkham, Freeze finds Cannibal Bill, a local Arkham cannibal, attempting to kill a nurse that was nice to Freeze. So, playing the "hero," Freeze dispatches of Cannibal Bill and his friends, then recruits the nurse to pay him back by helping him locate someone.
Someone be his father, and his new family. The house he's in belongs to them, and he's telling this whole story to his newfound stepmother and siblings. Turns out his father passed before he could plan dinner, so OH WELL. He goes on to fill in the gaps for them a bit more, how he got his powers, Nora, so on and so on.
Before Freeze sits down for dinner, he puts some suspiciously body part shaped looking things wrapped in garbage bags, along with the picture of his father (with his face cut out) and his family, in the freezer. As Freeze finally sits down to dinner, he brings up what his mother said to them when his father left, that family is everything, and now Freeze has a new one, which he's never letting go...
Because he's turned them to icicles.