1. IF you can documentarily prove that property in name of Step-Mother was acquired by Father thru his self-earned money, THEN you can file a Civil Court Partition suit to stake claim for your share of the property that was financed by Father.

2. Also check your father's income tax returns, where the finance for the purchased property will be recorded. This is necessary to prove in your favor in court.

3. Legally also You alongwith all the children of Step mother are entitled to EQUAL share of property of step mother, IF step mother has died with making any WILL. 

- If the property was purchased from the fund of your father in the name of step mother , then you can claim a right over the property left by your step mother legally. 

- Further after the death of step mother , her property would be devolved upon her legal heirs , i.e. her son and daughter and also you.

- Send a legal notice and ask your share in the property , and on refusal file a Suit for partition and Permanent Injunction before the court. 

If fate had executed gift deed step mother would be absolute owner of the property 

2) property would devolve on her daughters 

Yes you have equal rights in the same. If your step mother is legitimate wife then she and her children will also have equal rights

The property left behind by your step mother,which were on her name buy a registered deed, shall be her own and absolute property.

It shall devolve on her own legal heirs.

Her legal heirs are hr own children and not her step children.

You have a right over the properties that were left behind by yor father and your own mother, you do not have any rights over your step mother's properties.

The property of your step mother belongs to to your step sisters as they are the first heir after her death along with your father.

1. No

2. Yes it will be claimed by your married step sisters 

1. You are not a heir to your step mother.

2. Her heirs are her biological children, and they alone succeed to her properties.

Dear Sir, 

Being legal heirs of step mother, you may also demand share and for this you are suggested to file the partition suit.  

Through what mode property registered in step mother name ? GIFT deed or purchased in her name ?

If purhcased than all have 1/6th share each. And if your father is alive than she can claim sole ownership by filing declaration suit.

your step mother is absolute owner of property. 

your step sisters are class1 heirs, property devolve on class1 legal heirs.

1. No you will not have any share in properties of your step mother but you can claim share if you can prove that property was purchased by your father from his income. 

2. Yes property of your step mother will devolve among your married step sisters only.