I am so sorry for your loss.  If your sister's assets are under $25,000 then you can do a small estate proceeding to be able to deal with the mobile home.  You can possibly sell it and give the kids the money in a fund.  You should not need a lawyer.  Go to the Probate Court in the county in which she resided at the time of her death. I would not move it until you have authority to do so.  Good luck.