Hellobee Boards

Same, though I'd stick mostly to imaginative toys. A table with amazing art stuff. An area with a big train set, and maybe a set of big blocks and then small soft blocks. Some kind of doll house/fire house with figures. Dress up. Maybe a little puppet theater and soft puppets. Some kind of STEM exploration toys for the older kids. How fun!

A gaming system, no shame in them for older kids.

A teepee for the younger kids to snuggle in and book read, an easel for art projects and a train table (even if not into trains, you can use it to house doll houses, imaginext super hero places, paw patrol vehicles, etc.), and/or a lego table. Also a display shelf for books.

To add to some of the great ideas here: if it's a larger area, I'd also add some tent/tunnel stuff that folds away easy so they can all run around and do some good physical play together. Maybe even a mini indoor trampoline with the netting around it. Have a blast. I also love @Boogs idea.

I like the idea of stations as well. Art, train/Legos/Duplo table, play kitchen/food/table (my son loves having a table to serve us food on) and maybe an indoor trampoline and other gross motor things.

But I don't know how much the older two would enjoy those (outside of regular Legos) especially within in the next two wars. So maybe a cabinet with board games/books and a TV with some movie options and a video game system would be a great addition (a system like the Nintendo Switch (currently hard to find) or a Wii U would be great for that age range) if parents aren't against the idea.

I'd do a mounted Smart TV (for easy access to movies on Netflix) as well as a game system for the older kids. For the younger ones I'd just buy things specific to what their interests currently are. I'd do maybe a low kid sized table, a lot of craft stuff for the middle age kids, because the younger ones will use it eventually. For the littles I probably wouldn't go *too* crazy - maybe just some smaller kids toys and books....because they're going to outgrow it fast.

Oh, you know what else I would do, personalized sleeping bags! That would be so fun, and not a toy.

Blocks, magnatiles, an art station (with shelving and containers for organization), a book/reading area, a dress up area, and an area to display art.

In addition to the stations idea people have, i would add some type of play gym equipment like a slide, a small trampoline, some mats, maybe even a little bar to hang onto (like a child-sized pull-up bar). Not awesome for the older kids but great for the younger ones.

I like the following ideas:
-Pretend food/kitchen/diner area
-Dress Up/Play Space (maybe with a cool small stage)
-Arts/Craft Space
-Lego/Magnatile building space
-TV station (could be paired with a gaming spot)

We also have a bounce house that we pull out for our basement...I LOVE it! So do the kids...