You're almost there... the marathon effort to rebuild the farm has produced something so much better than what was there before the tornado. Congratulations! Just a few more tweaks and your gran will return to the best ranch in the county!
As with all the other games in this point and click series, you have to look around for things that will help you achieve your daily list of tasks to complete. If all goes well and you do not implode, you will have finished the job by the end of this game.
Look around, pick up things, think logically, and get this done!