It seems the son of Imaginary Keith lacks possessiveness.  Good for the world, but in this case, bad for his mother.  I give to you a recent sample, pulled directly from the page of his second grade report on a large, stuffed bear that he brought to school for sharing (show and tell for the old people).

This is my mom’s bear she had it hand made at a stor.  My grandma has a black won.  But my mom’s is gray.

And then the clincher.

My mom is about four feet tall and about four feet side-to-side also.