Sell property

Gransapa is alive or passed away?

Grandpa passwed away long time ago. All his sons and daughters also passed away except one daughter and 3 widows. I am one of the grandson

Assuming your Grandapa died intestate meaning thereby without making a WILL. So, first make a division/partition/distribution as it would have been done/made as of the date of grandapa's death. This will facilitate you who's the rightful legal owner of the property as of the date of grandapa's death. ok?

Then you can proceed on to giving the effect as on today.

We have now gathered that information. Would grandpa's duaghter's children (sons and daughters) have any part in the property? My grandpa died before 2005.

All my cousins are cunning and greedy people. How to take this forward if possible without them?

You need to provide some additional inputs. 

Was the grandapa'a property "self acquired" by him or "ancestral/HUF"?

2005, which you are referring is for the amendment in Hindu Law. It is applicable for ancestral property and NOT self acquired properties.

Our ancestors have been living there since long but we do not have any paper work and don't know where to check whether it is ancestral property.

which area you are from?

you can get 7/12 index of the property if it is outside municipal limits OR Property Regioster Card extract, if it is in any municipal limits.