Since it sounds like you have younger kids, I’d take a decent sized portion of it (maybe 2-8k) and use that to make lasting family memories. Seeing everything of interest in a short range (zoos, aquariums, caves, gardens, museums, national parks, whatever), more frequent small vacations (driving distance or short flights to the beach/mountains/whatever), occasional major vacations (other countries, theme parks, cruises, whatever your family finds interesting). Or investing in lifelong hobbies that you can do together, like skiing, art, tennis, restoring cars, etc.
After that, the rest I would add to my FIRE plan. It would not necessarily mean retiring sooner (though it might), but it would be about adding flexibility to my life. If my savings were larger, I could always just to dip into that to pay for college or I be better prepared to deal with an unexpected layoff or emergency.
I’m not sure I understand. You can stream music for free on Spotify, Tidal, Deezer, Pandora, Bandcamp, YouTube, and probably several other services. Not to mention the thousands of radio stations you can stream. It seems like there are exponentially more music streaming options compared to video. If you’re asking about sites where you can stream without ads, I’m guessing those exist too, but I suspect most people are either willing to listen to ads or pay for ad-free with one of those services.