Grizzly's mother, when asked about her age, answers that she's seventeen. Her voice actress is Kikuko Inoue, who initiated the "I'm seventeen years old" meme. The other characters also note that she looks rather young to be Grizzly's mother, which is possibly a reference to Inoue's youthful mother roles.
Executive Meddling: According to Aloha Higa's twitter, the publisher went and commissioned the anime without her knowledge and she was repeatedly denied by the publisher and the anime studio to address her concerns. She has since come to terms with the anime studio, but has put the manga on hiatus because of her problems with the publisher.
She has now resolved her problems with the publisher and will have her say in the character design and scripting process.
Irony: Both Panda (three younger siblings) and Full-Time Panda (two daughters with a third on the way) have or are part of fairly large families. In real life, pandas are endangered and getting them to breed in captivity is...non-trivial.
Names to Know in Anime: For whatever reason, Shirokuma Cafe is choke full of big name seiyuus, even for roles that are present for less than half an episode.