. >> reporter: alison john lost her 26-year-old son botham at the hands of police in 2018.s shot and killed in his own home by off-duty dallas officer amber guyger, who says she mistakenly entered his apartment thinking it was her own. their family, like floyd's, won a guilty verdic in court. >> what do you think they must be feel something. >> a sense of relief. i heard his brother tonight saying he could finally sleep. although i could tell you, up to now, i have not been able to sleep properly. because with every other death of a black man at the hands of police, it brings back that old wound. >> reporter: i first met alison jean last summer, one ofn mothers, most of whom lost children to police violence, who were feeling renewed pain. >> i didn't even want to see other people happy. i didn't want to see people laughing. because i lost a son who did not deserve to die in the way that he did. >> reporter: their bond of anguish rooted in pain, but marked by action. wanda cooper jones and tamecka palmer, members of this tragic sorority of sorts, one they prayed they'd never