1. Yes, your mother can claim the properties as nominee.However the nominee is a mere trustee and she after receiving the properties will have to handover the same to wife unless your mother is made the sole owner of all her brother's properties by way of Will.
2. The wife and kid can oppose unless your mother exerts her rights over her brother's properties by Will.
3.I am willing to take up. Feel free to contact. Visit mu website- www.acelegalfirm.com for details.