By Steve Holland and Humeyra Pamuk WASHINGTON (Reuters) -President Joe Biden plans to meet with family members of two Americans jailed in Russia: basketball star Brittney Griner and former U.S. Marine Paul Whelan, the White House said on Thursday. Biden will host separate meetings on Friday with Griner’s wife and Whelan’s sister, more than a month after his administration announced it had proposed a deal for their return to Moscow. “The Russians should accept our offer today,” White House press secretary Karine Jean-Pierre said. “We would love to be saying today that we have news about Brittne…