请帮忙理解下一下几个句子里个别词的意思?
1、Still, Jefferson freed Hemings's children-though not Hemings herself or his approximately 150 other slaves.中的Hemings是什么意思?
2、They have been spurred in part by DNA evidence made available in 1998, which almost certainly proved Thomas Jefferson had fathered at least one child with his slave Sally Hemings. And only over the past 30 years have scholars examined history from the bottom up.中的father是什么意思?