This page describes all of Lynn Loud Sr.'s relationships with his family and friends.
He loves his wife very much and is often hanging out with her.
In "No Guts, No Glori", they went to a restaurant together and both agreed to leave the children under the care of Lori.
In "Ties That Bind", they talk about getting rid of ties which their chidren mistake as getting rid of them.
In "Chore and Peace", they both agreed to let their children resolve their conflict themselves.
In "It's a Loud, Loud, Loud, Loud, House", Lynn Sr. had an idea of making the children cooperate but Rita criticized the results in which the children demolished whole house.
In "Suite and Sour", they wanted to spend weekend alone at a spa resort, which is something they haven't done since 1998. They also went to hotel pool together naked which got them kicked out of the resort.
In "Sleuth or Consequences", he and his daughters (expect Lucy) blame Lincoln for clogging the toilet, since his son has a history doing it, but it turns out that Lincoln was innocent of clogging the toilet. Lucy was actually guilty of clogging the toilet, and Lincoln takes the blame for her in order to save her from embarrassment, and as a result his dad grounds him.
In "The Loudest Yard", Lynn Sr. tried to do jogging with Lincoln. He was angry with Lincoln, when he discovered that he prefers playing at the arcade. Rita assigned Lincoln to a football team and he asked Lynn Jr. to dress up as him. Lynn Sr. was proud that his son was a football star but disappointed when he discovered it was false.
In "The Whole Picture", it was revealed that Lynn Sr. taught Lincoln how to ride a bike.
In "No Such Luck", Lynn Sr, his wife, and daughters start to ban him from all of the family activities after Lynn Jr. declares him bad luck for losing her baseball game. Eventually, they kicked Lincoln out of the house, and gave away all his belongings.
In "Fool's Paradise", Lynn Sr. and Lincoln worked together to prank Luan back after she was pranking the rest of their family.
In "Vantastic Voyage", Lynn Sr. helps Lori with her homework.
In "Fed Up", Leni helps him with dinner, and says she has the perfect outfit for the dish they made for dinner.
They don't have many interactions, but they both share a love for music and British culture.
In "Overnight Success", Luna once invited her friends to a house party but Lynn Sr. was kicked out because he was not on the list. He screamed at Luna for this.
In "House Music", he joined the family band, but Luna considered him too embarrassing, so she excluded him for the band. He went into deep depression because of it and returned to normal when Luna apologized and admitted she was wrong from the start.
Lynn Sr. is one of the few people who enjoy Luan's jokes. They both have a similar sense of humor, and enjoy each other's jokes. However, he couldn't stand Luan's madness during "April Fools Rules", and hid himself in fear from her.
In "Vantastic Voyage", Lynn Sr. made Luan walk all the way home from school.
In "Fool's Paradise", Luan made a deal with Lynn Sr. to help her in pranking the rest of the family in exchange for prank immunity.
They both love sports and Lynn is also named after her father.
In "Attention Deficit", he goes outside to play baseball with her.
In "Vantastic Voyage", Lynn Sr. made Lisa wear a saliva shield.
In "Two Boys and a Baby", Lynn Sr. looks after Lily while the rest of family goes to Aunt Ruth's.