Father Inheritence

slmz mufti.my father has two wives.we are 6 daughters.my mum has 3 daughters and other wife has three daughters.how should my fathers WILL be divided???

mufti,will it make a difference if my father has a business and my mother works in the business every single day of her life (for the past thirty years) and the other wife stays at home?? islamically,should the estate and business be divided equally between the two families??? should the other wife get an equal portion of the estate if she never contributed or helped my father in any way in the business,even though my father and mother had to struggle alone??

JazakAllah