It's very hard for members of a family to understand that their son or daughter could fall in love with someone from the other side of the world. Maybe having met just the once too.
It does happen - look at many of us on here,
Lots have been hurt, I am sure, but if you do find the right one, well life can be so rewarding not only for your son but also for the whole family too.
In time your son may tell us more about what is happening.
Like many have said, good luck.