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This is Dr. KV. I am so sorry for your loss. Please wait a moment as I am typing a reply to you now...
It must be a very stressful time for you and all the kitties. All 3 kitties are trying to adapt to this new living situation. Your older 2 female kitties are looking at the new boy as an intruder in their territory, hence the fighting.
All kitties may benefit from some key stress reduction tools:
1. Pheromonal spray and plug-in devices. These can be ordered online or available at most pet stores. The feline pheromones have natural calming properties.
2. Separate feeding and litter box areas for all 3 kitties.
3. Extra cat toys and cat trees to allow all 3 kitties to have a high spot to perch, as this can help them feel safe.
4. Natural calming remedies. Talk to your vet about trying some natural calming treats. Several companies make foods and treats for kitties with natural calming remedies. These can be very helpful.
Keep in mind that it has only been 3 months...this probably feels like a long time for you, but for the kitties, they may need more time to adjust to this new living situation.
Their are some training techniques that also may be helpful. Would you like some further info on some of these techniques?