Unknown primary tumor and dissemination of metastases. Hope for a chance to see his mother in Chile!

My boyfriend is very sick in cancer. The doctors can´t find the primary tumor and the metastases is spreading so they can only give him chemotherapy to curb the spreading and give him more time. We are in a middle of a chock and everything we planed for our life together seems fading away. But there is one thing that he needs to do and that is visiting his mother in Chile! They haven´t spoken for many years but I talked to his mother and she only want to se him and tell him how much she love him. The problem is that we don´t have the money to go and visit her. And we are running out of time. I feel embarrassed to ask for help but I don´t have any other option. So we will be so greatful if somebody could help us!! God bless you all!