I would normally say that feliway is for the exact opposite situation. It's for cats that feel territoriality challenged, often because of the introduction of a new cat, and thus feel the need to mark. But I guess these types of things don't always make intuitive sense, and whatever works is the right thing to do.
Based on what you've said, I do think introducing a new cat to a 7 year old cat who is known to be somewhat of a bully is obviously problematic. Also, I think cats have a very different sort of relationship with humans (especially their owner) than they do each other, so I wouldn't expect the reaction to be the same. Were they your mother's cats and you took them after her death? If that's the case then I probably wouldn't attribute the marking to her death, per say, but rather the change in environment and feeling territorial insecure that resulted because of it. But that's making a lot of assumptions on my part...
I think love and extra attention on your part is the best remedy to start with. If another cat is what is needed to make the house not seem empty and to help get you guys through the day, then I'm sure you can manage it, but just know that it probably won't be easy.
_________________ The little monsters 3
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