1) what is the status of division of property of father ancestral as well as self-earned?
Even the ancestral property was in his possession as his own property with your father which was mingled with his self acquired property during his life time, now the entire properties are intestate and devolve equally on all his legal heirs consisting his widow, children and legal heirs of his deceased son.
In the given situation the entire properties shall be divided into six equal shares and one each shall inherit their respective share as per the mutually agreed conditions of partition, if this isnot possible, then a partition suit can be filed before a court of law for partition and separate possession of the properties left behind intestate by your deceased father. The legal heirs to your father will be your mother, yourself, your three sisters, the wife of your deceased brother.
2) what is the division of brother's property, he died intestate, so will his property be bifurcated between his widow or mother or his widow will get whole share, provided she has no children and she is unmarried? and what will happen to the property if she remarriages?
This question has been answered in the above lines, however, if the widow remarries, after partition, then the share allotted to her cannot be reclaimed.
3) what is the share of daughters in movable and immovable property of father? and how they can get it? whether they have share in agricultural land or not?
They are entitled to an equal share even in the agricultural landed property.