Oh my gosh, I understand how you might feel obligated. Still, a queen-sized quilt is a serious undertaking. I'm afraid I'd communicate how loooooong such a project will take, and how expensive it will be. I suspect that, like my friend's husband, they'll forget about it when the onus is on them to come up with the materials and pay for the quilting. Just because they got you the machine doesn't mean they own you. There is no indentured servitude in this country.