Ya this, I know OP is grieving and everyone wants to offer sympathy and advice but I ran a large poly meetup for many years in a massive metro area. The number of times one parent went out and half checked while the other more mono parent took up most of the responsibilities at home is beyond incredibly common. And kids can absolutely read into this, they can read into the more mono parents unhappiness.

The entire post was also me me me me, nothing about how to help the daughters during an incredibly hard time, nothing about validating their feelings, their perspective. Yes grieving the loss of a partner is an incredibly difficult and horrible thing to do, BUT if you have kids your largest responsibility is to them and supporting them. Between that and the comment "he was content with just me." I'm going to assume she was like the other several dozen of scenarios ive watched over the years and was probably checked out having fun while the father was miserable at home and self sacrificing for the sake of the kids and the woman he married. Again a shitty thing but insanely common.