Rocky Start 
John and Lyndsay were NOT always friends.  They first met at a local theater company "Kids On Stage", where they first learned they were cousins.  John donned a classic mushroom cut, hawaiian shirt, and briefcase, and Lyndsay...lets just she say did not approve of her cousins actions.  "Mama Walsh" and "Yamie" (John and Lyndsay's moms) begged the two to get along, since they were only children and would be "all they had" when they got older.  After years of Lyndsay denying any relation, the two ended up at the same performing arts school where they began to do plays together.  A friendship began naturally and on John's 16th birthday (AKA Johnapolooza), Lyndsay was invited down to his Shore house. For his birthday, he asked one thing of his cousin: to make a video on her youtube channel.  She agreed and thus began the start of "A Cousins Production".  Since then the two have become the best of friends and have continued their music video parodies as well as started a few reality mini series.
The Fame Game
John and Lyndsay are now both dedicated to getting their names out in the big leagues.  They will fight anyone (including each other)  to be in the spotlight.  You might see them casually walking down the street with sun glasses on shouting: "Please no pictures! I just want to be normal", when no one is around them.  Jet setting, performing, and being loud is just a day in the life of the cousins.
Endearing Attention Seekers
"You are both obsessed with fame, but somehow....
it's healthy"!
Although the two walk around acting like they should constantly have  cameras on them (it would be selfish not to spread their hi-larious lives with the mass public, obviously), they are genuine and endearing.  The two have close relationships with their family and friends, making them their #1 priority.