yes take another loan, if your credit is good and you have been making all the payments on time. I am sure the bank will approve. But if you have been having problems repaying your monthly installments, then tell your child to do a civil marriage and a simple ceremony, as it may not be at your best interested if you start running into financial problems and end of in jail, like most defaulters in Qatar. Another solution is ask your child after the marriage to pay back the loan you taken. If the answer is no, you decide if you still want to go ahead with the loan.