property partition among family

Dear madam/sir, . My grandfather have two son and 3 daughter, after marriage of daughter, these two son decided to live separate and grandfather gave permission to live separate according to their resources, here two houses of both of them and grandfather and grandmother living with younger son(ladhu Singh) and elder son(hukam singh live separately). Grandfather given to 5-5 hectare land to his both of son, After ten year of gracious life ladhu Singh died by accident in 2010, basically he was a pharmacist. And ladhu Singh had not any children and he didn't make any will. After Hindu ritual of ladhu Singh here his wife left behind, and all property plots, houses, bank balance, insurance claim etc given to wife. And these all property are of city based dhanera(Gujarat), and grandfather and his elder son hukum Singh living in village I.e Rajasthan, After 2-3 years wife gone to her father house and all property take away, here in village there is 10 hectare agricultural land that is on name of grandfather and there daughter didn't demand any property from them. Question is that these old aged couple living separately from elder son in different house in village and grandfather(durjan Singh) gifted a 7 hectare land to his grand son(Hitendra Singh s/o hukum Singh) and left 3 hectare land is his personal that he purchased, is kept under his power. so i want to approach you sir is this any property given to durjan singh because hukum Singh is living separately and he keep doing well for old people. But ladhu Singh wife not given any share to Durjan singh and she wasn't have any children, so is durjan singh get return half share of property from his son widow wife? And is son widow wife have any share in land which is in village of Rajasthan and she is from Gujarat and living there?