A man paid EMIs for a flat registered in his father's and siblings' names, but now they deny his claim. He lacks proof of payment as he gave cash to his father. While recovering the exact amount paid is difficult without evidence, options like a family meeting or a gift deed from his father might offer some recourse. However, legal action against his brother, who is the main obstacle and hasn't contributed to the loan, is unlikely to succeed without concrete proof of the man's payments.