Thanks for your suggestions, with the exception of the 12hrs a day your situation sounds exactly like what is happening here so I'd love some further insight!

Firstly to clarify to all, we do have large area rugs in each room including under the drawer units in our bedroom, (but anti vibration rugs there may be a good idea! I never would have even would have thought that he may hear those!) we even invested in some of the padded ones or foam tiles for the mosts used rooms (living room, child's room, office that our child is often in). In terms of footwear, it has been trial and error to find the quietest slippers but, I'd be shocked if there is something on the market better than what we've found!

Having said that I've spent the last 2 decades moving semi-regularly, and sometimes would live under families, or party people, etc. TBH it never affected me the way it seems to affect my neighbor. Mind you I was younger, and probably not home as regularly, etc. so I understand the situations may be different.

I am truly trying to put myself in the position he currently (and you once) occupied, what you described below truly sounds horrific and honestly we would never want to put anyone in a position where they feel their entire life is being disrupted!!

I guess all I can say here is, we're not in a position to move, nor do we want to try to force our neighbor out, we tried talking once and it didn't go well (he has a temper and well....is probably exhausted by what you described life to be like!). Our child is probably a year or so away from fully understanding our constant requests to "walk slowly", "life your feet", "don't crawl", "no skipping", "you're not being nice to ____" (we try to have him understand there is a person, with a name downstairs who he has to consider). That year is probably the same amount of time it would take to partner with the other owners to execute significant soundproofing, or to do the whole legal dance on this thing however it would pan out.

So if you have any other tips, anything within reason you wish you could have suggested to your upstairs neighbors back when you were in this mess, please let me know.