I'm also going off memory, but something tells me that woman is Clara and not Isabel Lyon. The setting is Connecticut on a day where dining outdoors would be comfortable. I presume, without any evidence, that the film of Mark Twain walking around the house and standing in the doorway was taken on the same day as the dining film. That day seems to have been a day of very clement weather. I think, if I remember correctly, that Twain fired Lyon in March of 1909, possibly in April. I think Jean may have come to live with her father just around the same time. It seems unlikely to me that they would have dined outside in March, or even early April, in Connecticut, although I suppose it is possible. I think it's more likely the film was made in the summer of 1909, and that Clara was there for the occasion. There is something of a superficial resemblance between Clara and Miss Lyon, although Lyon was an older woman. That resemblance makes it hard to say for sure who the person in the center of the shot is, but there is something in the hairline that suggest Clara to me. I don't know what. This sort of visual detective work is not made easier by the very low resolution of the YouTube copy. I'd really like to see a pristine digital copy if one is available. In fact, the only person in the video who I can honestly say I am confident I know the identity of is Mark Twain, because he has a distinctive look about him. I believe the woman on the right of frame is Jean because she has Jean's lean, athletic build and angular features like her mother's. The woman in the center just doesn't appear very well in the YouTube copy. Whoever took the shot did some crummy composition work, putting the most active person in the shot behind some sort of centerpiece. Oh well. Carl