Dweezil? Ah your GF is a Zappa fan

Dweezil is probably confused with the move, having to share attention
with a rival (you), upset about the other cats- was he an only cat
before? How old is he? Older cats get VERY set in their ways and he's
been moved to a new place and if he was the only cat before he may have
problems adapting especially if he's old. Repeated spraying suggests a
number of things, he's feeling lost and has to repeatedly mark his new
territory, he has an UTI (stress can cause them) or if he's not
neutered that needs to be done.

Don't have any suggestions apart from a good vet check-up to rule out a
medical reason and if that comes back clear the vet can probably advise
on behaviour issues

One thing does worry me through when you call him the "Satanic
Siamese". He's not being "evil" he may have a medical problem or he may
be expressing being upset by the move.Don't demonise him. Actually I
wonder if his breed is part of the problem, meezers are intelligent on
the whole (I've met one that was daft) and can be quite demanding (And
I did meet the true "Satanic Siamese"- Clyde was a wedding present to a
friend of mine a lovely lilac point- lovely to look at anyway- going
near Clyde was something anyone with sense would only attempt wearing
steel gloves and wielding a whip- he was fixated on Kim, his meowmie
with whom he was a complete cuddle bunny but he loathed everyone else,
especially if they were talking to her or paying attention to her so
she couldn't pay attention to him. People who went "What a lovely cat"
and tried to make a fuss of him ended up in stitches and I don't mean
the laughing kind. Whenever we went to see Kim, Clyde would sit on the
curtain rail and glare at these people who were taking time his meowmie
could have spent with him away!)

Lesley

Slave of the Fabulous Furballs