I may be hard, but I would encourage you to make your son pay rent, even if
its only a token amount. The paying of regular bills and the consequences of
not doing so have to be learnt, and learnt early.

If you still feel its unfair him paying rent to you, take his 'rent' and put
it in a savings bond for him so that if he ever needs a loan or a deposit on
something big and worthwhile, the cash is there and he saved for it himself.

Why do I say this? because both of Joel's siblings never got their head
around paying their bills on time (both being in public housing you can get
away with not paying your rent for upteen weeks at a time) and then suddenly
they land on our doorstep with the "If I can't find <a huge sum of money> by
the end of today, I'll have to move in here or live on the streets." I'm
compassionate enough not to want them living on the streets, but I don't
want them living with me, and I don't want to cough up the money. But in the
end, my sanity is worth more to me than money and we've bailed them out. Of
course they *promise* (with tears in their eyes, even) that they'll pay us
back, but we never see a cent, and they promise that they've learnt their
lesson, but six months down the track, they're at it again (As you may have
been able to tell with the Daniel Debacle). Never in their adult lives have
they had to take real responsibility for themselves, and darn it, it shows!

Not at all implying your son is like that, but I firmly believe that people
have learn to look after themselves, and in families, everyone has to pull
their weight. Rent (or mortgage) is one of those facts of life that have to
be paid, may as well get used to it and get inthe habit of paying regularly.
Of course, YMMV, and you may know your son is already a perfectly responsile
adult, but its something I feel strongly enough about that I felt I had to
comment.

Yowie
(Who, when living at home, thought that the board my parents charged was
exhorbitant compared to those around me, until I moved out into the Real
World and would have *loved* to have rent, electricity, gas, phone,
shopping, food prep, laundry and housework all looked after for me at twice
that amount!)