ADDED: Saw you SWH addition. I think your husband needs a reality check and could benefit from a frank talk with your kids' teachers, or one teacher that he might respect. Sometimes people need to hear from a third party professional (not from a spouse) that something is a bad idea and needs reconsideration.....We also are in a very, very competitive public school district, lots of competition to get into specialized public school for math and science, lots of parents jockeying to get kids into gifted programs, etc. And lots of Kumon and other tutoring. But also a lot of burned-out kids. If your kids NEED academic help outside school that's one thing, but if your husband is pushing this just so they are going to "get ahead" of peers for slots in certain programs, get into certain schools etc.--it's not worth the burnout. If your son has learning disabilities, how does Kumon help other than with repetition?
If three of you --mom and two kids-- hate this, and he's the only one in favor, why don't the rest of you get any say in it??
ORIGINAL: Kumon is infamous for the homework packets and for taking up a lot of time outside the actual time kids spend IN the Kumon facility. Back when my daughter was in elementary school, we knew several families where the parents pushed Kumon and the kids all hated the work at home aspect -- not going to Kumon itself, the daily homework that had to be done on top of their school homework. All those families dumped Kumon before elementary school was over, especially as the school homework was increasing as the kids got older.
My daughter has gone to Mathnasium instead during summers only -- zero homework, everything is done at their site with tutoring right there AS the kids do the work. She has benefited a lot from that teaching model and enjoys going, in part because she can work intensely while there but doesn't have to do daily worksheets.
I am not sure why you're determined to continue Kumon if both your children--even though they are doing well at the academic aspect--actually cry and complain that much after an entire year of doing it.
If they are also in school (or being homeschooled by you), Kumon would be like an additional school for them--especially with work five days a week on top of other homework that must be done for school. If this is supplemental to school or homeschool, can you be objective enough to step back and ask why you're having them do it and what the goals are (are you possibly using it as their main instruction in certain subjects, if you're homeschooling? Or were they having problems with certain subjects in school/homeschool and this began as a way to help them work through those issues, etc.)?
I know the question is "how to make it a more positive experience" but if the Kumon model is not right for them, reconsidering it altogether might be solution. If you are determined to keep them there no matter what, a reward system might--just might--help somewhat. Yes, that's "parenting by bribery" as a friend of mine puts it, but unless you want to hear crying and complaints all the time, you might have to find another way to motivate them to do Kumon. But I'd really reconsider doing it at all unless there is a solid reason such as supplementing poor instruction at school or helping them over an academic hump where they don't understand some concepts.
How do their school teachers feel about Kumon, if they're in a school?