In Tarrey Town, you find Rhondson and Hudson discussing their daughter's upcoming move to Gerudo Town.
Quest Location
You can begin this quest by talking to Rhondson and Hudson at 3936, 1589, 0129, in Tarrey Town.
Talk to Hudson
After you talk to Rhondson and Hudson, you can talk to Hudson to proceed.
Talk to Rhondson
Then talk to Rhondson nearby to continue.
Talk to Mattison
Go up the stairs on the side of the building where you spoke with Rhondson and Hudson, and talk to Mattison. If its night time, she will ask you to join her lessons with Monari during the day. You can read the book in Mattison's room for help with the upcoming lessons. Then, if it's night, sit by a fire or rest in the inn until day.
Lessons with Mattison
You will find Mattison and Monari in front of the Goddess Statue in the middle of town.
Help Mattison Sneak Past Hagie
Hagie started charging for the railcar, so Mattison can't ride it to the construction site. You will need to block Hagie's view of the railcar. There is a cave opening in the wall southeast of the railcart station, so go into it to find Tarrey Town Tunnel. You will find a rounded platform at the end of the tunnel, with a Bubbulfrog behind it. After you get the Bubbul Gem from the Bubbulfrog, stand on the rounded platform and use Ascend. You'll get into the storeroom. Move the Hudson sign onto the bed, then open the door, and Rhondson will thank you for fixing the door. She will leave several Hudson signs leaning against the back wall.
You can use these Hudson signs to build a wall that blocks Hagie's view of the railcar, but don't build it while standing near Hagie, or he will realize what you are doing, and you will lose the construction materials. Try putting one Hudson sign flat on the ground, then attach a Hudson sign vertically on top. If you need more materials, there is a flat board leaning on the building across from in front of Hagie, and there are more construction materials in the eastern part of Tarrey Town. When you have finished the wall, put it in front of Hagie, and he will react to it, wondering how it got there. While he is reacting to the wall, talk to Mattison and tell her to try to go to the railcar. If the railcar isn't there, she will ask you to summon the railcar here, so glide west down to the railcar. You can shoot an arrow into the wood to start and stop it, and you can just take the arrows after. (If you hit the railcar, there is a chance that you will break it, so use arrows instead if you have them.) Make sure to stop the railcar when you are at the station. Hagie will be so distracted by the wall that you put in front of him that he won't notice and won't charge you for the ride. Then go over and talk to Mattison and let her know that the railcar is ready.
Find Some Flowers
Now you can glide down to the construction site and talk to Mattison. You will need at least 10 Sundelions, which you can find on sky islands, as well as on pieces of ruins that have fallen down to Hyrule.
When you have enough, talk to Hudson. There will be a cutscene.
Quest Reward
You will receive 200 Rupees. You can now talk to Rhondson in Tarrey Town to build a dream home. You will need 1500 Rupees to do so.