I was recalling a fantasy series I read when I was younger not too long ago. Woe is me, my younger cousin was in the room, and now he wants me to find out what the series was so he can read it too.

I'm looking for a fantasy series, probably aimed at 8-12ish year olds. I read it in the mid-2000s, so it's not too ancient. I distinctly remember some of these books having hardback furry covers - sort of like velvet, but longer fibres.

I also remember:

• The series involved a family living in a dilapidated and falling-apart mansion (possibly in Scotland, and I think it was called StregaSchloss... or something on those lines).
• I think the children's names were Titus and Pandora.
• There was a group of some sort of fantasy animals, possibly dragons, who I believe were family pets. One of the books involved one of these creatures skimming stones on a lake.

and... not much more. I'm hoping the names are enough to be able to pick the right series out, possibly with some help from a furry cover or two.

Any ideas?