Legal rights

Husband live (sr) A---- I A and B have 3 major children below I E had wife ( G ) minor son (F) I I wife deceased(sr) B---- I C --- FEMALE married adult eldest I G has a second marriage I D --- FEMALE married adult I staying with son F I E ----- MALE ( DECEASED MARRIED) I in this situation there was no divorce with E and G . E ( deceased was natural death). G got married 2nd time staying with her 2 nd husband with F (son of deceased ) do they have any stake in the property of A and B (deceased) ? and can F be a heir under these circumstance of A property is occupied A and B after E deceased in this situation. does G and F have any rights on any other property posed by A and B if legal heir certificate to be done who all will be included