Thanks for the replies.
Shox I am very taken with these birds and have decided I would like to breed them. I don't know whether the birds are related or not as I got them from a bird shop - I have been looking for some for over a year and they were the only one's I could find.
At the moment they are in a flight cage which is working out well as they are getting used to me - the one I think is the hen swears at me a lot but is calming down now
I have noticed they spend a lot of time on the floor of the cage so I always put in grass and sprinkle seed there for them. They should go well with the canary who makes a right mess of her cage, spreading seed everywhere.
Once I get an aviary set up I will look at getting another two.
Now a question, the hen doesn't have any tail feathers - is this normal for a young bird?