2013年3月,张某持一份遗嘱公证书来到笔者所在公证处,要求为其办理父亲遗产的继承公证和母亲房产的赠与合同公证。经查,张某的父母于2005年共同订立了一份公证遗嘱,将他们共同拥有的一套单元房指定由他们的二儿子张某继承,同时声明此遗嘱单方不得变更。张某的父亲于2010年去世,母亲一直独居,张某征得母亲同意准备将父母名 In March 2013, Zhang held a will of probate to go to the Notary Office of the author where he was required to handle notarization of the succession notarization of the father’s estate and the donation contract of the mother’s property. After investigation, Zhang’s parents jointly signed a notarized will in 2005 to designate a set of units they jointly own inherited by their second son, Zhang, and at the same time, declare that the will will not be unilaterally changed. Zhang’s father died in 2010, the mother has been living alone, Zhang acquired the mother agreed to prepare the name of the parents