For MLB's second generation players, love of game tops genetics – and science agrees

For MLB 's second generation players, love of game tops genetics and science agrees.

In Father's Day nature vs. nurture debate, MLB 's Sons know it's not just their genes.

Despite inherent advantages of growing up Holliday or Clemens or Bellinger, countless environmental factors will determine if the child’s most important adult acronym is OPS or CPA.

The chances of bestowing athletic genes on offspring at about 50% .

Certain psychological factors competitiveness, say have about a 20-30% likelihood of inheritability.

The pressure of following in a famous father’s footsteps can be immense.

Craig Biggio , the Hall of Fame second baseman for the Houston Astros , was retired by the time his son was in high school.

Cody Bellinger's dad was the Dodgers ' coach, but his friends joked about Clay Stare .

Matt Holliday played long enough that Jackson Holliday can remember kibitzing in the clubhouse and on the field with the likes of Nolan Arenado and Aaron Judge.

Biggio recalls catcher Brad Ausmus as a “funny, witty guy,” and appreciates the respect he was afforded from Astros such as Morgan Ensberg , Lance Berkman and Willy Taveras .