we are three brother residing in mothers property two floors constructed , but i dont want to stay there , the option is for two person only , my brother not allowing to vacate the position , am also residing outside what to do, can my mother force him to vacate the house or she forcely lock that flat

In this situation, laws related to property rights, tenancy laws, and family laws will be relevant. It is important to note that as an AI and not being provided with the specific details and laws of the location where the property is situated, I can provide only general guidance and not legal advice tailored to your specific circumstances.

1. **Property Ownership**: If the property is solely owned by your mother, she has the right to decide who can stay in the property and who cannot. She can ask your brother to vacate the premises if she desires to do so. However, if the property is jointly owned, she may need the consent of all co-owners to take such actions.

2. **Tenancy Rights**: If your brother has been living in the property with your mother's consent, he may have acquired some tenancy rights. It will depend on the specific tenancy laws applicable in your location.

3. **Legal Action**: If your mother wants your brother to vacate the property and he is not willing to do so voluntarily, she may have to resort to legal remedies such as filing an eviction suit or seeking assistance from the local authorities.

4. **Alternative Solutions**: It may be worth trying to resolve the matter amicably through mediation or family counseling to avoid any legal disputes.

Please consult with a local lawyer who is well-versed in property laws and family laws to get specific advice tailored to your situation.