She is a caucasian female. She has dark brown hair and eyes, like Juno. This much can be guessed from the fact that Juno's father has blue eyes, and his hair was apparently blonde.
He is her ex-husband. They divorced when their daughter, Juno, was about five. They have had no contact since.
He is her current husband. They live on a ranch and have three children together.
Once a year, she mails a cactus to Juno. Otherwise, they are basically strangers to each other. She most likely does not know about her grandson.