Depends on how you want to do things, the one I've seen quite a lot and works for us is having family work, one on one work, and independent work/play that can be done while the other gets the one on one, and review and change as needed.
So, for example, my 6 and 8 year old have done maths together previously as 8yo needed a confidence boost and both enjoyed it but now 8yo wants to do more maths so it's gone one on one with him doing more a day while the 6yo remains at the normal pace as it already stretches her and if anything, she enjoys it more as we can take our time with it more.
Music we do together, usually with the 3yo. Reading aloud can be done as a family as well, all curled up together, and the kids' reading they can do themselves, as a family listening to them, or they can read to the 3yo while I work with the other. A lot of things can be done together, particularly at primary age, as long as you add extra support for younger ones and extra stretch for the older ones. Nature walks: the 3yo tells me what she can find and we talk about it, the 6yo has a drawing pad where she draws things she finds and talks, the 8yo draws and writes about it while talking. And nothing better for virtuous zoning out that watching a documentary together on a topic of interest for them.
It takes planning and always being up to review and adjust the situation to fit all the personalities, needs, energy limits, and time constraints, but it's very manageable and just becomes part of the rhythm once you find your own system together.
Hope this helps, feel free to PM me if you want more in-depth information on planning it all out.