Where can i get a treehouse on millsberry?

The hammock and the treehouse are sold in the hardware store under Gardening. You get your heart/health up by grooming. Buy a hairbrush or toothbrush or towel at the grocery store. You will need to save it in one of your rooms. Once saved when you click on it and the little screen pops up there is a choice of "Groom". Click on that and it will raise up your health by 1%. Other than that I haven't found any other way to raise it. It may raise on it's own if you eat healthy food and take rests from the site. My son looked up some cheats and they said the best thing to eat is the lasagna and fruit salad. Between the two it covers all your food groups. Any more questions feel free to email me through my profile. I'm a Millsberry junkie.