My son-in-law died recently. I understand that my granddaughter may be entitled to his share of the estate left by her paternal grandfather when he dies. How would my granddaughter, or my daughter on her behalf, go about making such a claim following his death?
Your question seems slightly premature. If your son-in-law’s father doesn’t leave a will, then the share that would have passed to his son will now pass to his issue, ie your granddaughter if he had no other children. However if his estate is sizeable enough to worry about the chances are that he has made a will, and will probably update it now his son has died. In that case he can leave his money and property more or less as he chooses.