Thank you for your advice. I was thinking that taking up the floor boards and isolating them from the joists would be they way, but you advice sounds much easier!.. One other question. We are thinking of taking out one wall, between the family room and one bedroom , so making a huge (well for here anyway) room, would this: make the sound problem worse (more floor area to radiate sound and "drum") or Better (more air to vibrate and dissipate the sound)?
Again thank you for you advice cheers Jon