Dear Sir,
The shortcut way for your mother to proceed is to invoke section 5 of Senior Citizens Act. Then your mother must take to possession of tenanted houses and to induct her own persons on rent. Your mother must say that by her own earnings/savings and by your (younger son) contribution the house was constructed. Mere suit for permanent injunction is not maintainable without seeking relief of declaration since all documents stands in the name of your mother. On this ground itself suit filed by your elder brother will be dismissed. For more suggestions please contact me.
Section 5 in The Maintenance and Welfare of Parents and Senior Citizens Act, 2007
5 Application for maintenance.
(1) An application for maintenance under section 4, may be made
(a) by a senior citizen or a parent, as the case may be; or
(b) if he is incapable, by any other person or organisation authorised by him; or
(c) the Tribunal may take cognizance suo motu.
Explanation. For the purposes of this section organisation means any voluntary association registered under the Societies Registration Act, 1860 (21 of 1860), or any other law for the time being in force.
(2) The Tribunal may, during the pendency of the proceeding regarding monthly allowance for the maintenance under this section, order such children or relative to make a monthly allowance for the interim maintenance of such senior citizen including parent and to pay the same to such senior citizen including parent as the Tribunal may from time to time direct.
(3) On receipt of an application for maintenance under sub-section (1), after giving notice of the application to the children or relative and after giving the parties an opportunity of being heard, hold an inquiry for determining the amount of maintenance.