Preparing for island ep?

i am probably gonna have a Lilo and stitch inspired gameplay, and make a big sister challenge out of it. So its about a lonely girl, with her older sister who trys to get a job to provide for her, since the parents died. She has no friends and is kinda lika an ?outcast?
Maybe instead of stitch as a pet or an actual alien, Lilo will discover the lore about the Island and also the deep (and maybe dark) secrets of the mermaids.