1. IF consent / NOC is already executed in favour of Wife (Mrs. XYZ), by the legal heirs of XYZ and IF the CHS has already transferred flat in favour of Wife AFTER receiving No Objection Certificate from CIDCO, then the legal heirs (2 married daughters have already relinquished (forfeited) their right on the property of their father.
2. IT is safe enough for the new buyer to execute sale agreement with Mrs. XYZ, subject to again obtaining No Objection Certificate from CIDCO. The original consent / NOC executed by legal heirs (2 married daughters) should be annexed and should be a part of the fresh sale agreement.
3. There remains no need to again obtain consent/NOC from the legal heirs (2 married daughters) during current execution of the fresh sale agreement.
4. The legal heirs (2 married daughters) now have no right to the property of their father, after executing consent / NOC in favour of their mother. However it is advisable to check for any unwanted / reservation / restriction clauses in the consent letter / NOC executed by the legal heirs (2 married daughters).
Keep Smiling .... Hemant Agarwal