Britt said Hannah "did really well."
"She is very strong. She had a few moments, but she is very strong," she said.
Britt said she plans to raise Hannah, who has plans of becoming a firefighter.
The family handed out a memorial card that included a prayer verse and a message that read: "We express our heartfelt gratitude to all of you in our time of need. Thank you, The Anderson and Britt family."
The card included a photo of Christina and Ethan. Christina's death date was listed as August 3, and Ethan's as August 4.