capital gains tax question

[dreaddan]

Hi, Im trying to get my head round CGT and had a few questions.
We have recently moved house but have not sold the old house yet.
If we let some of our family live there for a year or so before we sell it without charging them any rent.
Would CGT apply?
if so from when?
When we move out or when they move in?

Thanks
Dan

[dreaddan]

Thanks.
Makes things easier