Grammar for "Morning time"/circle time/together time

[RealLifeMama]

We do mad-libs during circle time, and that is fun, but most of my kids need Grammar instruction, so I am wondering if this is something we can do together. I'd like to try it, but I don't know what to do.
We have not done a lot of formal grammar at all, so I am not sure where to begin in a way that is not going to waste my older kids' time, but that is not going to be skipping too much for my younger ones.

(My 4 yo will just take in what she can, I don't expect her to follow along much.)


My school age kids are 7, 9, 11, 15 and 17. the 7 yo knows nothing beyond noun/verbs, capitalization at beginning and ending punctuation. She can sort of write sentences.

I was thinking of maybe diagramming sentences on a white board and letting the younger ones do the subject/verb stuff and the older ones do the modifiers and such, but I'd love a book like Easy Grammar to just go though. The problem with choosing Easy Grammar is that I don't know what grade to start with. I think really any level of instruction is probably helpful, but I also don't want to completely waste my DD's time as she has a lot on her plate and several things she is supposed to spend 10 minutes on.

Any advice? I have some Easy Grammar grades 3, 5, and 10 and FLL already, but we have not used them. We have a homeschool store that sells stuff on consignment, so I can pick up something else easily. Any suggestions?