Does the wife have to give back the properties given to her by her husband in case she asked for Khul`?

Unfortunately, one month after concluding my marriage contract, my wife asked for judicial annulment. At present, I`m living abroad. Should I return to Jordan for the annulment? What are the financial rights that I`m entitled to receive from wife; namely, gold, money and gifts? Is it permissible that I take these although there is no serious legal reason for the judicial annulment?

My son works in America. He met a Muslim girl there and they concluded their marriage contract in an Islamic court. He paid the whole Mahr (Bridal money) in addition to the expenses of the betrothal. The total sum is estimated at about 30.000 dollars. For reasons unknown, the girl refused to consummate the marriage. Is my son entitled to recover the Mahr alone or the Mahr and the expenses of the betrothal?