I can't be 100% sure of anything.The info was given to me many years ago by two of Jennie's nieces (both deceased now).They agreed on these names, the girls being their first cousins.
I do know that one of Jennie's brothers moved to Florida - though whether it was after retirement or earlier I don't know. It's always possible the Stricklands moved away as well.
I recall Edith and Ann also mentioned a cousin Virginia living in Manchester but they had two cousins named Virginia: Strickland daughter of Jennie and Virginia Burke daughter of Julia Anderson. I don't know which one they were referring to.The Virginias had sisters named Dorothy & Doris respectively.
I recall Edith giving me Dorothy Strickland's date of birth as May 4, 1918 from a birthday book she kept.She did not have dates on the others so I can't be sure of Virginia Strickland's birthdate.