Mark Davis-Welles is a pre-made Sim, living in Roaring Heights with his wife Rita Davis-Welles. In their family bio it is stated that they are happily married, however they are both in love with other Sims. It's up to the player whether to expose them to the public or have them stay happily married.
Mark and Rita both have a same-sex relationship with other Sims, just like the Shear couple, however they both keep it a secret from each other. Mark is a spoof of Thomas Buchanan, a character from The Great Gatsby.[confirmation needed]