Okay I've decided to explain why Nana ignores Tsuna a little earlier than expected hehehe. The eagle of plot came by and I didn't want to forget it by then. Therefore before I start all the flash backs will either be third person point of view or nana's view. Sometimes Iemitsu but most of the time if it's Iemitsu then it's not a flash back. Okay I bet all of you are bored so let's get to it:

"I hope mama will award me a hundred points if kill this lizard or maybe the dog next door," Thought Tsuna. Surprisingly he's still playing the game even after several months have passed. Therefore giving him a whopping 10,000 points. He never stopped believing that if he did this maybe Nana will call him cute again, instead of Eiji. He walked into the kitchen and grabbed the chef's knife. (We all know where this is going;] He then proceeded to walk into the neighbor's yard and with a childish grin, and call out for Mr. Growls. Or at least what he calls him. The awful little Chihuahua came running and ready to bite him. But little Tsu Kun had a surprise oh yes Mr. Growls won't be Mr. Growls anymore. He'd be Mr. Silent, but Tsuna had an idea, lucky Tsuna, when he goes to tell mama he'll get extra point for coming up with perfect cover up. He put out his arm and let the fiend dig into his flesh tearing it like a piece of paper. Then he opened up the gate and with it still holding his arm dragged him to his front door unlocked left it wide open and walked into the kitchen. He then stabbed the dog right in between the eyes. Then he dropped the knife, washed his hands, and pulled out a bowl, a box of cereal, and milk. He filled to bowl with milk some cereal then knocked it onto the floor and dumped most of the cereal the ground before dropping the box on top. He was so excited that he forgot about the bite and how much it'll hurt once the adrenaline wears off. Lucky for him Nana came in minutes later and saw her supposedly beloved Tsuna running towards her slightly wincing as the adrenaline was wearing off. Once she got a good look at him, she saw the torn flesh and grabbed saying what the hell he was doing. He brought up some almost fake tears. Keyword almost. Tsuna started to feel severe stinging in his arm as Nana shook him freaking out not know what's wrong with him. He then put his almost act and pointed at the kitchen saying That the Komati's left their gate open and didn't know so opened the door for fresh air was hungry so he went into the kitchen for some food when their dog came running in and bit him. The only thing he said he could reach to protect himself was the chef's knife. Then she understood and ran to the kitchen to what the damage was. She saw the mess of cereal and the dead dog. But surprisingly she wasn't mad she was just empty. How could she not, she left the six year old now and could get into trouble with the law. She cared for Tsuna's wounds and thought of what to say not seeing through his impressive act. Then she remembered the game and smiled down at Tsuna with her own act going saying "well done Tsu Kun you earn a hundred points for killing the dog". She felt disgusted at herself for killing but like last time she can't get caught and about the dog she can just lie and say she's hasn't seen him. She felt horrible then an idea came to her. Something in her brain either clicked or snapped either way it was bad. She thought that maybe if she just forgot about Tsuna sometimes then maybe he wouldn't tell anyone out of his own accord. (what was she thinking) Hence the reason why Tsuna is almost always forgotten.