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

In the situation described, if one of the brothers is not paying the EMI for the home loan which all three brothers took together, the other brothers can take the following actions:

1. **Communication**: The first step would be to communicate with the brother who is not paying the EMI and try to resolve the issue amicably. They can try to understand the reasons behind the non-payment and explore possible solutions such as restructuring the loan or seeking financial assistance.

2. **Legal Notice**: If the communication does not yield results, the brothers can consider sending a legal notice to the defaulter brother asking him to pay the outstanding EMIs and warning of legal action if he fails to do so. The notice should be drafted by a lawyer and sent through registered post for it to have legal validity.

3. **Approach the Bank**: The brothers can also approach the bank or financial institution from which they obtained the home loan and inform them about the non-payment issue. The bank may provide guidance on the next steps to take and options available to resolve the situation.

4. **Seek Legal Remedies**: If the above steps do not work, the brothers can consider taking legal action against the brother who is not paying the EMI. They can file a civil suit for recovery of the outstanding amount and seek a court order to compel the defaulter brother to pay his share of the EMI.

5. **Partition of Property**: In case all efforts to resolve the matter fail, the brothers can also explore the option of partitioning the property. This would involve legally dividing the property into separate portions so that each brother gets ownership of his respective share, and the responsibility for the EMI payments also gets divided accordingly.

It is advisable for the brothers to consult with a lawyer who specializes in property and banking laws to understand the legal options available to them in this situation and to effectively resolve the issue of non-payment of EMIs by one of the brothers.