First of all, welcome to the forum! There is a lot going on in your brother's household right now. I was thinking one thing until I got to the part where there is a second bengal. Rescuing a bengal from a breeding program is quite different than getting a kitten from a breeder. You don't know what type of situation the kitty came from -- was he housed in a cattery (most male cats are housed away from the other cats). Was he allowed to socialize with members of the breeder's family. At any rate, you cannot expect him to come into a new home and settle in immediately. It's quite stressful, especially when there is another cat involved.
Neutering a male does not instantly change their behavior. He will continue to mark! The inappropriate peeing could be a number of things -- was he ever litter box trained? Does your brother have THREE (yes, THREE) litter boxes for the two kitties? Are there multiple cat trees? Some think adding another cat is no big deal, however, it is a huge deal to the resident cat. Bengals are highly territorial. Know, too, that it is extremely common for the new kitty to hide. Let's face it -- EVERYTHING is new to him. He's terrified. Your bother is just going to have to have patience and work with these kitties. There is a proper introduction process which keeps the two separated and then swap scents from bedding. It usually takes a couple of weeks before you even put the two cats together. If the cats get off on the wrong foot, it can take some time to get things back on track.
The other thing is that you always take a new cat to the vet for a checkup! I honestly don't know that urine is supposed to be thick. But, a wellness checkup is always a good idea to start a medical history on the new cat.
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