1. if the property is the self acquired property of your late father, then after his demise, the property will go to his widow and children in equal shares. This is assuming that your father has not left behind any Will.
2. your brother cannot deny your right and that of your younger brother in the property.
3. you should issue him a legal notice to partition the father's property by metes and bounds and distribute the sale proceeds among the legal heirs.
4. but first try to talk to your brother. only if he refuses to your request, you can take legal steps to safeguard your right in your father's property