Birth

Mary Cheney, Partner Welcome a Boy

05/23/2007 at 05:00 PM EDT

Vice President Dick Cheney's daughter Mary has welcomed her first child, a son.

Samuel David Cheney was born at 9:46 a.m. on Wednesday at Sibley Hospital in Washington, D.C., ABC News reports. He weighed 8 lbs., 6 oz. He is the first child for Cheney, 38, and her partner, Heather Poe, 46.

"The vice president is pleased to be a grandfather for the sixth time," spokeswoman Megan McGinn said.

Dick Cheney revealed last month that the baby would be a boy. "I'm delighted I'm about to be a grandparent for the sixth time," he told ABC News Radio. "I'm looking forward to the arrival of a new grandson."

Cheney's press secretary confirmed in December that the couple were expecting; later that month, President Bush, who opposes gay marriage, told PEOPLE: "I think Mary is going to be a loving soul to her child. And I'm happy for her."

Lynne and Dick Cheney with grandson Samuel David

David Bohrer

Mary Cheney, vice president for consumer advocacy at AOL, met Poe, a former UPS manager, when they both played ice hockey during college in Colorado. Poe has been renovating the couple's suburban Virginia home since they moved there after the 2004 reelection campaign.