The glimpses into the future:
2005: Ruth (59) and Bettina plays with a yard-full of dogs. Evidentially Ruth gets her doggie daycare idea off the ground.
2005: David (36) explains the embalming process to Durrell (11).
2006: The family celebrates Willa's first birthday. Attendants are Brenda (37), Maya (3), Ruth (60), George, Margaret, Olivier, Billy (with a puppy!), David (37), Keith (38), Anthony (8), Durrell (12).
2009?: David (40) and Keith (41) tie the knot. Anthony (11) and Durrell (15) are best men. Father Jack performs the ceremony. Guests include Brenda (40, pregnant with her third child), Maya (6), Willa (4), Brenda's new husband, Rico (35), Vanessa, Ruth (63), and George. Claire (26) takes photos. (According to Entertainment Weekly's "No Small 'Feet'" column, Brenda's new baby is named Forrest, and her husband is Daniel Nathanson.)
2025: Ruth (79) dies in a hospital bed with Claire (42), David (56), and George by her side. Before she passes, Nathaniel and Nate appear to her.
2025: Ruth's funeral. Attendants include Claire, George, Keith (57), and David. The man at the grave with David is Durrell (31); the man sitting to Keith's left is Anthony (27). The woman sitting to George's right could be Maya (22). Ted shows up to meet Claire. (Note that the same actor who plays Adult Anthony can be seen sitting behind Maya in the clip from 2009.)
2029: Keith (61) drives an armored truck for his own company, Charles Security. He unloads the back and thieves shoot him to death.
2030?: Claire (47) and Ted marry. Guests include David (61); Anthony (32) and his boyfriend/husband; Durrell (36), his son, and pregnant wife; Brenda (61), Daniel, and Forrest (21).
2044: A huge family gathering. Claire (61) and Brenda (75) talk at a picnic table. David (75) sits with his boyfriend (again, according to EW) and watches a family football game. Keith appears to David, and he dies.
2049: Rico (75) on a cruise with Vanessa. He gets off his deckchair and heads for the door, but has a heartattack and dies.
2051: Billy pontificates to Brenda (82) as she dies of ennui.
2085: Claire (102) dies in bed with a nurse nearby. Her eyes are clouded with glaucoma. Photographs on the wall include George and Ruth (2005?); Ruth and Bettina (2005?); Brenda, Maya, Willa, and Daniel at David's wedding (2009); Nate from Claire's collage-mask series (2004); David and Keith (2020?); Nate and Brenda from the wedding series (2005); Maya (2005?); Claire and Ted at their wedding (2030?); and Ted in bed from earlier in the episode (2005).