I have to agree with most of the posters too I am afraid
. You probably feel right now that people are not on your side, but everyone has really tried hard to help with your problems as they have arisen. I and all the posters know pups can be frustrating, annoying and damned hard work, in return for this they give you love, happiness and never ending loyalty, but it does take time, and that is what you and your family have to be prepared for.
All puppies look cute, and cuddly and
very small, but you have to be prepared for all the hard work involved in bringing them up/training them, call it what you will cos at the end of the day you are caring for a baby and as such
they know nothing and depend on you to teach them the way to go.
I have a bunny too in a run, and yes Katie did bark when she first saw him, but I took her mind off bunny with a game of football, each time we went outside she was allowed to look and then her attention was focused on the game, now she does not even bother with the rabbit only to go up and say 'hello'.
I do hope you and the family decide that Ollie is worth persevering(sp) with, but if not, please do take the advice of other posters in regard to rehoming the little man. Good luck with whatever you decide to do.