If you want to take a loan to buy that property , i do not think bank or FI will permit it to be owned by third party ( your wife + mother) that is not the borrower, at the same time , there is NO way , those two can be treated as owner/ landlord to ask for rent from you , to further claim HRA.
you better take loan, regsiter that property in your name,once you make all revenuue and municipal documents in your name , you may GIFT it to your mother +wife , onec there name is included in place of your name , then again you execute a notarised document of rent , and pay them rent by cheque , and claim HRA , at the same time LOAN repayment will be your responsiblity , as Bank is not in loop in this entire process. this is OK as per IT tax , but remeber this jugglary is unethical also.....choice is yours...