I think it was her parents life. To many clues for it.
Rhoda and Jared might be siblings. We also have all that weird portraits in the art gallery foreshadowing.
I think the fact that Jared also Loved MCs wife is to be taken as a pseudo-kinship. So MC's wife is Jared-Rhoda's adoptive/foster daughter, which makes them MC's pseudo parents and parents in-law if he marries Rose. Or Wife and Jared had pre-narrative sex, then Rose would be wife's daughter aka MCs step-daughter to keep all the LIs on the same social
Level.
I am a little miffed at the fact that MC is a Typical
No-use Dad in a
Daughter-service Harem.
Plot progression is the girls telling him, what and with whom to do it next and every conflict resolution is MC caving in to begging and steamrolling of one character or leaving the room and
Let the Girls Discuss It.
A-okay concept for a character in a hospital suffering Amnesia (with all his (surrogate) daughters being medical staff), very unbelievable for a Teacher and single-father of four, who allegedly is an authority figure forced to have had made hard choices.
Gets old real quick. Might been burned one time too often... but this where harem stories go to die...