BOSTON — This is where it all began, just a mile beyond the Green Monster, where Theo Epstein fell in love with baseball as a kid, and forever changed the fate of two iconic franchises.

And this is where it continues, with his twin brother, Paul Epstein, still living in their hometown of Brookline, improving lives around him as one of Boston’s finest humanitarians.

Born 60 seconds apart, these two brothers, who chose to utilize their ultra-competitiveness in different facets in life, will be together again this weekend. They’ll be watching Theo’s Chicago Cubs visit Fenway Park for the first time as defending World Series champions, and then getting together trying to raise nearly $1 million for charities.

The weekend is being billed as a potential 2017 World Series preview, with box seats going for as much as $800 for the three-game series beginning Friday. The Cubs’ 2016 World Series trophy and Red Sox’s 2004 World Series trophy will be on display Saturday evening at their Hot Stove Cool Music charity concert. And the Sunday night game will be nationally televised by ESPN.

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Yet, throughout the weekend, a figure who won’t don a uniform will be the center of attention.

The only executive to build World Series championships in Boston and Chicago, ending combined droughts of 194 years. The man who anointed the world’s greatest leader by Fortune magazine, yes, two spots ahead of Pope Francis.

“We’re calling it Theo-palooza,’’ says Red Sox president Sam Kennedy, who grew up playing baseball with Epstein. “It’s going to be all about Theo this weekend.’’

That’s not an uncommon occurrence. As perhaps the most respected franchise builder in sports, Epstein’s capital in baseball is significant – and makes others ponder how he could spend that in other arenas.

Epstein, predicts David Axelrod, chief strategist…