I kept rabbits for a couple of years. A few things I learned in that time:
Rabbits are shy and diffident, and often don't like being held or picked up because they are fragile and will be injured if dropped.
You will need more than one rabbit. A rabbit alone, in an outside hutch, will be a very lonely bunny indeed.
Rabbits need a varied diet with plenty of hay, something to bear in mind if DS is asthmatic. It's one of the reasons I had to have mine rehomed.
Rabbits are a lot of work, particularly outside. You will end up doing a lot of heavy lifting of sawdust, hay etc. They wee a lot, and although you can litter train them to go in one place, it can get whiffy if not changed frequently.
Rabbits need a lot more space than most people think. How big is the hutch?
Rabbits can live for a long time and you will do the bulk of the work (and it is work!), however if properly handled and socialised, they can be very good pets.
www.rspca.org.uk/servlet/Satellite?pagename=RSPCA/RSPCARedirect&pg=RabbitsPetCare