we are three brother took home loan , constructed two portions , one of my brother put lock to one portion and not paying emi what to do and the other brother not staying with us

In this situation, you can consider taking the following legal steps to address the issue:

1. **Consultation**: Initially, try to resolve the matter amicably by discussing it with your brothers and explaining the consequences of not paying the EMI.

2. **Legal Notice**: If the above step does not yield results, you can consider sending a legal notice to the defaulting brother who has put a lock on one portion, demanding him to pay the EMIs and vacate the portion or allow the sale of the property.

3. **Seeking Legal Intervention**: If the defaulting brother does not comply even after the legal notice, you may need to seek legal assistance to enforce your rights. You can consider approaching a civil court to seek a partition of the property or enforcement of the loan agreement.

4. **Property Sale**: In case the defaulting brother continues to neglect his obligations, you may need to explore the option of selling the property to repay the loan, provided it is legally feasible under the terms of the loan agreement and applicable laws.

5. **Consult with a Lawyer**: It is advisable to consult with a lawyer well-versed in property and banking laws to understand your legal options and get guidance on the best course of action based on the specific details of your case.

Please note that the legal procedures and actions may vary depending on the specific details of your situation and the terms of your loan agreement. It is recommended to seek personalized legal advice to address your concerns effectively.