I am sorry that you are angry with your dad.
And I don't at all doubt that you love your bunnies.
Thanks for being open and sharing your personal frustration. It's not really off-topic...it's more like background information. Knowing a little about what you are dealing with helps me to understand better why you seem reluctant to get your rabbit to the vet. I still think a vet visit would be a good idea, but I realize that without the needed money or transportation...that makes it quite difficult.
You said the sore is at a place where the bunny rubs the water bottle. Perhaps you can replace that bottle, or at the very least give that bottle a regular scrubbing and disinfect it. I know your other rabbits don't have similar symptoms. But keeping the bottle clean could help prevent the possible spread of anything infectious.
Also, I would isolate this bunny from the others if at all possible until the sore has fully healed. Isolation can be inconvenient...and the bunny may not prefer it...but I think it's for the best for a while.
You did frustrate some of us who were trying to help you by commenting that if the cream were bad for the bunny it "would have been gone already." Perhaps you could have used a better choice of words to explain what you meant. Saying something more like, "I've used this ointment before" or "My vet recommended this once before" or "She hasn't had any problems with this ointment...here are the ingredients...anything I should worry about?" would get your point across better.
We all have to be reminded from time to time to be careful what words we use. Remember that everyone who answered your post did it because they care deeply about bunnies and bunny owners.
I do hope that your bunny has a full recovery and that things at home get better for you, too. :brownbunny