Inheritance

Q: My question is about distribution of property according to sunni shariat. My mom has 2 sisters. Out of my two aunts only one has children of which are daughters. My other aunt doesn't have any children. My mom is the only one with a son. So after the Death of my aunt the property is to be distributed between her sisters, i.e my mom and aunt since my other aunt did not have any children. So my actual question is that should my mom receive the property in 2:1 ratio since she has a son?

Marrying one's father's daughter

Q: My mum got married to my dad when she was very young. I was a result of that marriage that didn't last. After few years my she married a man that became my dad in every way. I got married and had kids my wife is a cancer patient and gave me permission to mary again. On the night of my walimah I found out that my dad got married again after my mum and had 2 kids a boy and a girl. He got divorced again and married another woman from whom he had a daughter who happens to be my second wife. We already consummated our marriage. I am so confused.