Linda Jefferson

Mrs. Jefferson is Rowley's mother, and the husband of Robert Jefferson.

Personality
Mrs. Jefferson is perceived to Greg as highly overprotective, polite, loving, caring, showing most of these qualities to her son. She loves Greg to accompany her son, and this has been a recurring element since Rodrick Rules.

Appearance
Mrs. Jefferson is illustrated as wearing a long skirt, black shirt, and curly hair. In some of Greg's illustrations, Greg has depicted her as wearing a night gown, but this was only shown in Dog Days, when she goes to bed.

Rowley Jefferson
Overall, Mrs. Jefferson has a good relationship with her son, since she is highly defensive of her son. Mrs. Jefferson seems to often be concerned about Rowley such as when Greg broke his big toe after he put one of Frank's dumbbells under a pillow that Rowley kept kicking at Greg's sleepover. She also had Greg apologize to her for what he did to her son. She loves Rowley more than anything, and even goes to the fullest extent of spoiling her son, similarily to Greg's mother spoiling Manny.

Greg Heffley
Greg and Mrs. Jefferson had a good relationship throughout Rodrick Rules, until Dog Days, when Greg snapped a Rubberband against her son. Like her husband, she is implied to dislike Greg, since his actions in Dog Days shows that the feeling is mutual. Before this, she has always enjoyed Greg accompanying her son.

Robert Jefferson
Overall, Robert and Mrs. Jefferson have a good relationship between a husband and wife. Similarily for what Greg assumes his parents to spoil Manny, Rowley's Parents constantly spoil Rowley, baby him, providing Rowley anything for what he wants in his life.

Susan Heffley
Mrs. Jefferson has a close relationship with Greg's mother, such as in Rodrick Rules and Dog Days, where it was shown that she supports the idea of having Greg to accompany Rowley and to fill in for Rowley whilst he was injured.

Trivia

 * In the Internet book, Rowley Jefferson's mother, Mrs. Jefferson's name is hinted to be Linda Jefferson, but this may not be her name in the Book series, as there are many differences between the online books and the real ones.
 * Although not making an actual appearance in The Last Straw, she was mentioned in the last sections of the book, where Greg said "Then his (Rowley's) parents kicked us out of the house."