Property rights.

Hi Sir, Hope you are fine. I need your help in one clarification regarding property rights. Myself Anu, from Kerala. For my father we are 3 children myself,brother and sister. I am the elder one, my sister she did (Love Marriage) without informing us. They went absconding and got married. Now she and her husband came long back and she has one month old child and trying to stay in our home. We are NRI's and only grandmother is staying there. My father has got small share from his father and that property which came to him from his father (Our grand father). Some property My father purchased also. Along with my father he is having 3 brothers and 4 sisters. After my grandfather death, all these 8 people shared the property equally. Now my father has got two properetis: 1. Land from his father (Our Grand father) 2.Land he bought Now my sister is asking share to my father for the share got from his father. Since she married to some other caste guy who was not interested in my father, now my father is not willing to give equal share to her and he told he will give some sort of property as per his wish. But she is saying she will file a case to receive an equal share of property. So my father wanted it to be divided only for other children (i.e. Me and my brother). So, is there any option for him to do as he wishes? So if she puts case also she should not be entitled to equal share. My question here is : 1. Though the property came to my father from his father - Does she can get equal rights out of it? 2. Since she married to a person who was not interested in the family - Is she entitle to an Equal share? 3. Recently I have seen in one media that, girls who marries to other person opposing to parrensts, by making love marriage, they are not entitled to share of any property of the father. Is it true? 4. As per my father wish is there any option to do, to divide the property only among is two son's me and brother. Could you please clarify us with above doubts. So that we will remember you for life time and my father will also will be happy according to his wish.