Welcome to Derry family tree

The Hanlons are the family that ties the series to It. Major Leroy Hanlon is a pilot of the United States Air Force, enlisted to fly a B-52. His wife is Charlotte, and their son is Will.¹

Will grows up to be the father of Mike Hanlon, one of the Losers of the films. The Direct notes that Will and his wife Jessica die in a house fire in the films, which leaves Mike to be raised by his grandfather.¹ Leroy is therefore the grandfather of Mike, and the Welcome to Derry family tree draws three generations of Hanlons from Leroy to Mike.

Charlotte is the open question of the tree. She is not in the timeline of 1989, so her fate is unknown.¹ Leroy, meanwhile, stands up to General Shaw on the base after the Black Spot burns.²

Hank Grogan works at the theatre in Derry, and his daughter is Ronnie.² In episode 7 Hank hides at the Black Spot, the club of the Black soldiers, and Charlotte plans to get him out of town. When a masked mob arrives, Hank turns himself in while Ronnie screams.²

The mob chains the doors and sets the club on fire. The next day the radio reports Hank among the dead, but his death was faked. In the finale Ronnie and her father drive out of Derry.^2,4 The Welcome to Derry family tree draws the Grogans in their own blue ring beside the Hanlons.

Will and Ronnie hunt Pennywise with three friends. Lilly Bainbridge lost her father in an accident at a pickle factory, so the chart draws Mr. Bainbridge with the cross of a death.³ Marge and Rich complete the group, and the chart marks all five with the letter K for the children of 1962.

In the fire at the Black Spot, Rich forces Marge into a freezer that holds only one person and sits on top of it. A firefighter rescues Marge, and Rich is found dead at his post.² Dick Hallorann leads Hank, Ronnie and Will to a crawl space and out of the fire.²

Three links run from the series to the films. The first is the Hanlon line, from Leroy and Charlotte through Will to Mike.¹

The second comes in the finale. Pennywise tells Marge that she will one day have a son, and the makers confirm to TVLine that Marge, years later, becomes the mother of Richie Tozier, one of the Losers.^4,3 Collider adds that Marge fears the clown could go back in time and target the parents of the Losers.³

The third is a short scene after the credits of the finale, in which a young Beverly Marsh appears. She grieves for her mother, Elfrida, who seemingly died by her own hand at Juniper Hill, and TVLine ties the scene to It Chapter Two.^5,4 The chart draws Beverly in the last row without her parents, who belong to the films rather than to the families of 1962.