Vadim Simovitch

Vadim Simovitch was never introduced into The Sims, and is deceased long before the start of The Sims 2. He was married to Fatima Simovitch, as we see on his family tree. Together he and Fatima had a daughter, Betty Simovitch, who is introduced as Betty Newbie in the tutorial of The Sims.

Life leading up to The Sims 3
In The Sims 3, Vadim is an adult and lives with his wife Fatima Simovitch and their daughter Betty Newbie in Riverview.

Life leading up to The Sims 2
In The Sims 2, Vadim is deceased, but his tombstone is not in the game. We can see him in Brandi's Family Tree.