Game gets constantly updated so this walkthrough may be little bit outdated but you'll get idea how to play and what to do for a better result.
Everything was already illustrated and described in this PDF file Visiting Aunt Sara Walkthrough (http://forum.69games.xxx/pics/visiting_aunt_sara/visiting_aunt_sara_walkthrough_v1_0.pdf)
Play Visiting Aunt Sara (http://gamcore.com/games/visiting_aunt_sara)