If "shicheii" means "maternal grandfather," why can't you say, "My maternal grandpa has a donkey?"
Yáʼátʼééh! This is still a new course, so please, try adding your sentence with the report button. The English translations can vary here, so (my) "maternal grandfather" / "grandfather" / "maternal grandpa" / "grandpa" are possible translations. :)
"My maternal grandpa" and "my grandpa" should both be accepted
Be consistent. The object remains either one or both
I wish it had pronunciations. although I'm still grateful to people providing us with this course.