Will related

The property in question is not an ancestral property because 'An ancestral property is an undivided property, in which four generations of a single family have their share' and in this case this clause is not satisfied. Hence the lady has every right to bequeath her property as per her wish and will.

The property had been conveyed through the Will, hence it is in no way ancestral. Tfw brother's wife has the full discretion to convey or otherwise deal with her  property  during her lifetime, The settlement deed is legally valid.

Under "Women's Property Rights Act 1956, any asset that comes into the hands of a woman by way of will, gift, sreedhana etc., will be deemed as Self Aquired Property in the hands of that woman. So, she can dispose it as she wishes

Will executed by one of the two brothers qua his (testator's) share is valid and operative after his death.

The property bequeathed by her husband through aforesaid will is "self acquired" which can be disposed as the beneficiary of the will (widow of brother) desire.

Settlement deed executed by mother (widow of one of the aforesaid two brothers and beneficiary of will executed by her deceased husband) is valid and legal which cannot be challenged.

The settlement property lost its "ancestral" tag much before coming in favour of widowed mother who have further distributed it in favour of one of her son and daughter.

Thanks all