Under the Muslim law, distribution of property can be made in two ways – per capita or per strip distribution. The per capita distribution is prevalent in Sunni law. According to it the legal heirs get equal share in the property of the deceased person.
The per strip distribution method is recognised in the Shia law. According to this method property devolves upon the legal heirs on the per stripe basis and each stripe gets equal share.
Here I advise as per the Sunni law because majority of population belong to Sunni. Deceased’s parents, wife and children are the legal heirs. So the property will equally devolve upon legal heirs. All will get equal share because Muslim law does not discreminate between the male and female legal heirs.
Your father has died intestate hence, your mother and siblings are the legal heirs. There are ten members in your family hence each member will get 1/10 share in the property. Therefore, each member will get 0.9 acre land in the inheritance.