Jon Smith Tricou is the patriarch of the large Tricou family. He lived with his family in the House of Fallen Trees, although they have all died. Upon examining the family's memories, Jon Smith appears to have been the first of the family to die - old age, most likely - leaving a large inheritance to his wife.
Also, he has relations with some teen downtownies to do with him, although you cannot see it from his family tree, only the teenagers'. The most notable one is the kid who dresses like an goth, with white foundation on, and black lipstick with short blond hair. Also, another boy is dressed up with sunglasses, and Johnny Smith-style hair, but darker. He is also wearing a red body warmer. There are 6 in total, and you can see the Tricou family from their family tree.
In the UK and Brazilian Portuguese versions of The Sims 2 Nightlife, his name is Johnathan Tricou.