In the event of after getting divorce, only husband is responsible to pay permanent alimony and maintenance under under S.25 of Hindu Marriage Act. Father in law is not responsible. If one does not want divorce, but wants to get maintenance, she can move application under Section 125 Cr.P.C. or Section 18 of Hindu Adoption and Maintenance Act. Again, in these two instances, only husband is responsible to pay maintenance. As such it is no where that father-in-law has to provide maintenance in the case, when husband is not earning. But, Section 20 of Domestic Violence Act says that the respondent has to pay maintenance. If father-in-law would be made as respondent, who was harassing the daughter-in-law, there may be chance, but it is a difficult chance.
Next, if there is divorce, wife does not get any share either in husband's or father-in-law's property as the relations have been severed by legal procedure.
Second question: If the property is father-in-law's self acquired property, then daughter-in-law has no right on it, until and unless he executes a will giving whole or some part of the property to her. If it is ancestral property, husband has got right till he survives. If daughter-in-law survives her husband, then only she will get the share of husband. In your case all these things are not possible.
In domestic violence Act, there is a provision for shared household. If wife demands husband has toprovide shelter. There is a hope for you in that Act, if you can prove that violence has occured to you in your matrimonial home.