Determining the status of Z in such property

A, B, C made a Registered Deed of Endowment relating to their joint properties at village in favour of their family Deity and thus divested their ownership in favour of the Deity and made another registered Deed appointed thereby E, F, G, H, & I as the Shebaits for their generations together with the obligations to offer daily prayer and pujas and celebrations of the bi-annual festivals of the said family Deity as per prevailing customary practices. Shebait I died leaving behind IW (the wife of I), ID 1 (the eldest daughter of I), & ID 2 (the youngest daughter of I) as his legal heir. On the solemnization of marriage of ID 1 on the demise of I, IW on her behalf as well as on behalf of minor daughter ID 2 and ID 1 transferred all their interests to the said endowed properties by virtue of a registered instrument in favour of the legal heirs of E, F, G and thus settled much away from the territorial limit of their endowed properties. Meanwhile H & I made an oral grant in favour of Y - a co-villager to make a makeshift to run his grocery shop in the southern part of the endowed property. Z having obtained such oral grant started to run the grocery shop and thus enjoying the physical possession of the said southern part of the endowed property. Now Z - the only son of Y when started to develop a concrete construction of the said grocery shop, all the legal heirs of E, F, G, H all started to raise objection against such attempt of concrete construction however, Z clearly declared he has been running the grocery shop in the southern part of the said endowed property for more than 35 years and he is having the Trade License in this regard from the competent authority in this regard. Ultimately a civil suit has been file in this regard against Z before the competent court of jurisdiction. Determining the status of Z in such property justify whether Z has any right to make concrete construction thereupon?