Answer to the question 1: After Lao Zhang's death, Lao Zhang can's property can only be inherited by Lao Zhang's son, but the son died first, and his grandson and granddaughter subrogation inheritance, but the daughter-in-law can also enjoy a share of the property if she does her duty to support Lao Zhang. This method is often used in inheritance disputes, and it is generally valid by court decision.
Answer to question 2: Lao Zhang remarried. His property belongs to the property before marriage. If there is an agreement with the spouse, it will be divided according to the agreement, and it is not agreed that Lao Zhang will inherit after death.
Answer to question 3: The legal inheritance of the estate is appropriate, except that Lao Zhang has a will, which can be inherited according to the will. If there is an inheritance dispute, the court may consider the maintenance of the elderly by children or others when solving the judgment. Even if the first heir fails to repair the old man, he may lose his inheritance right. There was no inheritance dispute, but the second problem was solved.
If Lao Zhang is an only child and his mother has died, his father's property is also regarded as Lao Zhang's property and inherited in the above way.