Sisters Lauren and Sienna Betts of the UCLA Bruins hug in the final minutes of the NCAA women’s basketball championship game against the South Carolina Gamecocks at Mortgage Matchup Center on April 5 in Phoenix. (C. Morgan Engel/NCAA Photos via Getty Images) Ahead of National Siblings Day on April 10, about half of U.S. adults who have a sibling say they are extremely (24%) or very (30%) close to at least one, according to a Pew Research Center survey. extremely or very close to that family member","note":"Note: Responses for spouse or partner are based on those who are married, living with a partner or in a committed relationship. All other items exclude those who do not have that family member.","source":"Source: Survey of U.S.…