1, the one with real estate license: it can't be bought or sold at present. You must handle the division of the estate, and you can go through the transfer formalities at the real estate trading center through consultation; If negotiation fails, you can bring a lawsuit to the court, or you can go through the transfer formalities with the effective documents of the court.
After your death, your sister-in-law's daughter will not inherit your inheritance.
3, a set of no property right certificate, should apply for property right certificate as soon as possible, otherwise can't determine the ownership.
Your grandmother's share, if there is no will, your grandmother's children have the right to inherit.