Ghislaine Maxwell 's brother is publicly backing former Prince Andrew Mountbatten-Windsor ... claiming his actions may have been "sleazy" -- but, prosecutors clearly can't find any sexual misconduct dirt on him. Ian Maxwell -- Ghislaine's older brother -- spoke with the UK publication The Telegraph on Thursday ... which just so happened to be the day Mountbatten-Windsor was arrested on suspicion of misconduct in public office. The former prince had a known association with Ghislaine and her