I’ll chime in! My always homeschooled kids are in 12th, 8th, 7th, 5th, 4th, 2nd, 1st, K, with a tagalong almost 3yo and 8 month old.
I have found that it depends on the subject and on the student! My oldest has been a driven, independent learner for a long time. She doesn’t have any group subjects this year by her own choice. She’s doing math, latin, chemistry, government and economics, art history and creation, home ec, and language arts/writing/literature. She also has a 6am scripture study class with other teens from church M-F. She split into her own science in 7th grade. Her history books were separate but generally on the same time period up until 11th grade, when she decided there was a specific time period she wanted to study and it didn’t match up with the rest of the family. Government and Economics is separate from the family this year. Wo do a family scripture study but do not do a ‘morning basket’.
The next two kids are an 8th grade boy and a 7th grade girl that are only 13 months apart in age. The boy was a later reader (I suspect some dyslexia) and he and his younger sister have always worked together on the same general level. This year they share a science course of their own. They still participate in the family history study, our book club, and family scripture study. They have their own language arts curriculum (The Good and the Beautiful, which includes art, poetry, and geography as well). The 7th grader is very artistic and draws daily. They have their own math levels.
Then comes the ‘elementary kids’. They are combined for history (plus the 7th and 8th grader). They are combined for science as a group. They are part of family scripture study. They do art as a group (both appreciation and creation).
Each elementary kid has their own math level. The 5th grader has his own language arts curriculum (The Good and the Beautiful, again, it includes geography, art, poetry, literature, writing, grammar, etc). The 4th, 2nd, 1st, and K each use All About Reading at some level individually. They have handwriting (as does the 5th and 8th grader) and this varies between Handwriting Without Tears and the Good and the Beautiful Handwriting levels. They have their own literature books to read once they can read independently to some degree (currently that is 1st, 2nd, 4th, 5th).
Almost everyone also takes lessons and plays piano (the 7th grader played for a year but really didn’t love it, so she pours that practice time into her artwork or writing).
Phew! I hope that makes sense. Basically, around 7th grade my kids move to their own science but stick with the family for history (with their own reading to flesh out to their age/interest). Beginning in High School each teen chooses their own courses with some guidance from me as needed. They have the option to be with the family for some subjects or with another child a similar age. They can pursue interests. My 12th grader has done a lot of writing including regular work on a couple novels. She has studied herpetology and raises two bearded dragons, a ball python, and a dubia roach colony (to feed the beardies). She’s worked with veterinarians. She has a part time job at a bakery/bistro and works with the head baker as her assistant. She studied mythology (greek, roman, norse, Egyptian). For us, teen years mean taking on more responsibility for your own learning, but having more freedom in what you study.
I’m happy to answer questions if you have any!