Bob
his son looks a lot like him i know his son, that's the only one i know sorry
It is singer Faith Evans>
Liam Payne's son is named Bear Grey Payne. He was born on March 22, 2017, and his mother is Cheryl, a British singer and songwriter.
Stepson; Son in law; Brother?
The son of someone's mother is commonly referred to as their brother.
Greg
The mother finally names her son Paul D. Colbert.
Bessie Griffin's son was named David. He followed in his mother’s footsteps in the music industry, although Bessie Griffin is primarily known for her contributions to gospel music as a singer and songwriter.
Mephibosheth was the son of Jonathan, who was the son of King Saul, and his mother's name was not specifically mentioned in the Bible.
Rex and David
Heath
I would think you would call her by her name, same as if she were your son's American mother-in-law.