My personal minhag is not to eat gebrokts, but not to be makpid on gebrokts keillim. However, if one who does have the minhag not to eat from gebrokts keillim, I don’t think it is appropriate for them to have to compromise on their practices. And as DY insinuated, I think most normal in-laws wouldn’t mind giving up on gebrokts if that’s the only way their family can spend Pessach together.
dovrosenbaum:
I don’t see why people who keep perfectly KFP homes and who brok should have to do backflips to accommodate “machmirim.”
They don’t, unless they happen to want those said “machmirim” to spend Pessach with them.