Fly my son to me please

I moved away from my family in siem Reap and my lovely little son was born in the UK. I have one more son in Cambodia who is 11. I would like to take my son to cambodia to meet the family and then fly back with both my sons so we can be a family again. I miss my son so much. I was hoping to work to pay for him to co where but I now have very poor health and so money is hard to come by and would be happy if you could help me. thank you