Property right as second wife and children after husband's death

Many years ago , Saroj ( hindu) got married to Jagdish (hindu) ( who earlier said that his first wife is dead and he has children from first wife ) in orai, Uttar Pradesh. After marriage I came to know that her first wife is alive and live in her home; whom he deceptively told that was her servant. I adjusted anyhow in her home, but later after giving birth to one girl and one boy, Jagdish started domestic violence with me and threw me out of the home declaring his first wife as the only wife and denying me and my children Since then it's been many year, I followed the long legal procedure, but I am very poor and hardly manage my daily finances, I live with my parents who are very old now. Recently I came to know that my husband has died, but she wants my and my children't right in his property. Jagdish children from first wife are very affluent and strong in power. Please provide legal advice and procedure in this matter.