A brother and sister were involved in a probate lawsuit involving undue influence. This probate & inheritance lawsuit over dad’s estate came to a head after theprobate trial. No jury. On September 9, 2014, the appeals court ruled on the probate judge’s trial. If you are a brother or sister suing your sibling over undue influence or are involved in an estate lawsuit, such as a will contest, you may want to read this very recent probate decision.