There are five co-owners and all have joint possession. Therefore it is impossible to sell the share of one owner without affecting the actual division. The property must be definite at the time of sale. Its boundaries, area and ownership should be well defined in the sale deed. Without partition you cannot claim that you are the owner of a particular portion of land.
You cannot sell the land without partition
You should first divide the land before sale and demarcate boundaries and area for each owner. Thereafter you can sell your land. This process is mandatory otherwise the sale deed will become void. The other co-owners can sue the purchaser and refuse to give him possession over the land.
Can a daughter claim her share?
No, in this scenario the daughter cannot claim her share in the property. Your father had already divided the property among the sons. The amendment of Hindu Succession Act (HSA) does not apply in your case. Section 6 of the HSA confers coparcency upon the daughter. Therefore, the daughter gets share in the ancestral property by birth.
This property has already been divided before the coming into force of the amendment Act. Therefore, the daughter has no right to claim share in this property.
Cancellation of sale deed
If you sell this land without partition the co-owners will sue the purchaser and file a civil suit for the cancellation of sale deed. Without partition you cannot claim which portion of land belongs to you. Your possession is not defined yet. Hence, you cannot sell the land.