That is the tactic that I would try first-- I might also try adding that you want an "advocate/advisor/other parent" to be able to understand the meeting clearly, as well.
If that doesn't work, ask WHY NOT. Wait for an answer.
If all else fails, bring a "recorder" who will take extensive notes-- and then pop those notes DIRECTLY into an attachment on an electronic LOU to everyone concerned.
I seldom have a way of recording meetings, but because I'm a zen master at the LOU, most participants have learned to be quite careful what comes out of their mouths at a meeting. If I'm saying little, it's often because I'm WRITING, and woe betide any administrator to whom I say "That's interesting. Can you explain that to me?"
Fair warning here-- if you're that worried that they won't let you record, I'm assuming that you have reason to think that you're dealing with weasels (for lack of a more polite term). Insisting may be seen as pretty confrontational at this point. Be sure that you can afford to burn this bridge.