Oral transfer of house property among four brothe

My grand grandfather had 4 sons and he bought 4houses n transferred all the houses among his sons equally . But he transferred it orally to two sons n two sons n the other sons hav their registered houses on their names but the 3rd sons house which was orally transferred to him is registered on the name of 1st son who has his house n his name n one house in which the 4th son lives which was orally transferred to him is on the name of 3rd son. All the 4brothers have died n their next generation is suffering now. The 3rd son had 4children n his one son has transferred our house means the 4th son's house on his name and want to sell it. Now my querry is that is it possible that our house in which we r living since 40 years taken by them then where will our share go? Is it right what he(3rd son's one child) did after his father death n that too transferred on his name only? Plz help me out. I m very much distressed due to dis situation.... plz suggest something nice which cud save my property...its mine.....