Brothers & Sisters Season 4 Episode 21 (Brothers & Sisters s04e21) with title “Where There’s Smoke…” airs on Sunday, April 25th 2010 at 10:00 pm via ABC Network. In this 21st episode, More than one member of the Walker family suspects she might be pregnant, Nora offers to take her aging mother in (Starring By : Marion Ross) when it’s discovered she has dementia. Okay Brothers & Sisters Lovers, don’t miss to watch this great episode on your TV network and don’t forget that Brothers & Sisters Season 4 Episode 21 airs on ABC Network at 10:00 pm.