Anne Heche's ex-husband James Tupper has filed paperwork in court to become the legal guardian of their 13-year-old son, Atlas Heche Tupper.According to new legal documents, obtained by ET, the 57-year-old actor filed a «petition for appointment of Guardian Ad Litem.» He's also filed a «Notice of Intent to File Objections to Homer Heche Laffoon's Petition for Letters of Administration and Competing Probate Petition.»In the docs, Tupper states Atlas «has no guardian of his estate» and that he is Atlas' father and «only living parent.» What's more, Tupper says he «loves both Homer and Atlas as a father and wants the best for them both.” And „in order to preserve family harmony and a healthy, brotherly relationship between Atlas and Homer, and given the complexity this estate will foreseeably involve, a bonded, neutral, private professional fiduciary would be a more appropriate administrator.“The first hearing on matters of the estate is scheduled for Oct. 11.Tupper and Homer have been at odds over who should control Heche's estate since she died back in August following a fiery car crash in the Mar Vista neighborhood of Los Angeles.