Every couple of weeks?? Please don't do that.
My parents came twice in 4 years, I went home every 3 months (so Christmas, Easter, summer for 10-12 days each time max). I was a 2.5 hour flight away but tickets were £10 so I went as much as I wanted. Some of my friends went home every couple of weeks, but THEY chose to.
Keep your distance, especially when/if he goes into a houseshare. One of my housemate's mother was so interfering, to the point that she wanted to know what the rest of us were doing as well. Why - I will never know, we weren't her children...
It was so tiring and annoying, she somehow got hold of our full names and phone numbers - she would message on FB, text, 'check up on us'. If not directly, via her child - who phoned her daily, on speaker, from the kitchen table - they also updated the mother on what we were up to, in front of us. It was very weird and I'm sure you won't do that, but start with backing off now!