Evidence that Sarah is in Washington.
Her private twitter shows her at the Seattle Gum Wall and also the location is labeled as "Seattle, WA."
In a livestream, Greg flashed Sarah in the background.
Same hat and hair as in the Seattle pic. Instagram photo was posted October 17th, 2017.
In some of Taylor's recent videos there is a mysterious unnamed person recording them, such as the "I Got A Tattoo" and "My Gender Reveal." Sometimes you can even hear that person snicker. It is most likely Sarah, to ne it is obvious.
Greg and Taylor have been going out and also appearing in YouNow broadcasts occasionally. They can't do that if there is no one to watch the kids. Taylor's grandmother wasn't there long enough for it to just be her watchibg the kids. It is also suspected that Sarah could be staying in the guest house so that they can claim it as a business expense. Greg's been throwing off a lot of hints like thanking "you guys" for picking things up at the store.
On Patreon, Taylor posted a video that featured Sarah in it called "Carpool Karaoke" on September 21st, 2017.
Taylor also has been saying that they no longer want a girlfriend. They started saying that around the time Sarah is suspected to have once again arrive in their household. Taylor would say that they wanted a companion and friend to talk to while Greg is busy working and that is why they wanted a girlfriend.
Sarah tweeted out that she misses her brothers and sisters. Where could she be that would be far away from them?
Taylor has said in the past that they would never bring Sarah back in secret. Taylor is hiding this from her audience and blatantly lying about it in her YouNow streams. Sarah could also be purposefully acting like she is not in Washington to go along with the whole thing.
They all know that if Sarah is there that it will cause an uproar. Sarah is still a minor, under age 18. Last time Sarah was there it became "too dangerous" to have her there again. Why risk that again? Why be dishonest with your audience?