"Thank you so much for hanging in there with us, and keeping your ear open to our needs. Thank you for supporting me, and helping me learn how to support my mom in this difficult process."
"It's just nice to know that you're out there helping people like us."
"We appreciate all of the support and resources you supplied during this very difficult time and will refer anyone in need in the future to your organization. Thank you for your compassion during this process."