LOL... yet another reason why we homeschool. I know exactly how much my son is doing on his own, how much I'm helping, and what he really needs help with vs. what he WANTS help with, and can balance that.
This is actually a REALLY fine line for parents to walk. So fine a whole term called "afterschooling" has been developed. I mean, say your child doesn't get the multiplication table. Do you just let them sit confused and turn in F after F, and hope they're not the only one confused so the teacher will spend extra time instead of building on a foundation the other kids already get... or do you sit with them and reteach them the multiplication table, and make games out of it, and practice with them, and correct their work? In the "real world" (hate that phrase, school is part of the real world) but in ___(hated phrase)___ professional writers have a whole TEAM that helps them through publication (nothing you ever read in print is the result of a single individual), and in academia there are whole other kinds of teams helping with research, proofing, editing before submission... ditto science, ditto music composition, ditto mathematics, physics, medicine, etc. So WHERE do parent's draw the line??? WHY is it unacceptable for a parent to proof read an essay for typos, or to say "You know, I think this phrase would have more effect at the end" or "The pacing seems a little off to me, how about tying in ______ here, or cutting this section entirely?" When it is proven time and time again that the BEST time to learn from a mistake is immediately after it's made, while the process is fresh in your mind, is it not okay for a parent to check their child's math/ spelling/ etc HW, but preferable for them to find out 1 day to a week later when they get the assignment back? Don't even get me started on research. Most kids have no clue how to go about research, and NO teacher in elementary can sit with every child for every paper and brainstorm sources (although some valiantly do this in AP courses in highschool... most kids don't get that benefit), much less are most elementary kids capable of taking notes on the discussion/brainstorm with the teacher (heck, even as a college student I can have trouble taking notes fast enough).
I mean... obviously... you don't fill out a worksheet for the child. But anything beyond that is a fierce debate between parents AND teachers who sit in different camps, and those camps can change year to year.
Yes, it is FAR more prevalent in affluent families to have parents really involved with their children's education, with fairly predictable results. Especially by highschool... because highschool determines college... and college tends to be very important to affluent families. Personally, I MUCH rather would see an overinvolved parent, than an underinvolved parent. <laughing> in large part, because the "do it myself" rebellion happens more with overly involved parents.
I teach a classroom of 1 at the moment (excluding TA'ing undergrads), but I know a LOT of teachers. While many groan about parents who are overinvolved, the general consensus is, however, that it is THEIR kids who in general go on to success in school. While kids with underinvolved parents tend not to. Of course you get brilliant self motivated kids with absentee parents, and lazy "do it for me" kids with overinvolved parents. But those are BOTH the rare cases.
Again, though, yet another benefit of homeschooling. I spend less time teaching my son in an average day than his friends in away-school parents spend helping with them with homework or afterschooling. Seriously. His best friend has an average of 3 hours of HW every day. Which is an average of what we do in a school day. 7 years old, for crying out loud. What 7yo needs 3 hours of homework??? 15, yeah... but 7???
Whoops.. slight tangent. But, yes, you will find parents (or classrooms, or whole schools) where the parents do "what the other parents are doing" whether that's being overly or under involved.