The will does not require the signature of the children. A self-written will is valid. If it is a self-written will, it only needs to be written and signed by the testator and marked with the year, month and day. A valid will must meet the following conditions: (1) The testator must have full civil capacity. (2) The will made by the testator must be his true expression of intention. (3) The testator must have the right to dispose of the property disposed of in the will. (4) The content of the will must be legal.