So thanks to the volume chapters we know that Sasha's mom cheated on her dad, took Sasha purely to hurt him, and leaves Sasha alone in their house. I think Sasha and Papa need to kick that bitch to the curb. None of this saving the relationship stuff.
To make it a full circle with my comment for chapter 85.5 where he promised to get back his wife and all live together as in a family in Japan...
https://typemoon.fandom.com/wiki/Shirou_Emiya
Sasha's dad will become an ally of justice and unite his family!
No matter the result, his ideals aren't wrong!
The pursuit itself is blindingly beautiful!
Keep simping, Sasha's dad...
Honestly with how promiscuous and unfaithful modern western women seem to be from a casual observation (of course men play a part by allowing such a culture to be acceptable, " it takes two to tango"), Sasha's father might actually inspire some men to keep on striving for the sake of their children or urge Neckbeards to not be 'holier than thou' and waste their entire lives holding out for the perfect "pure" woman that they might not even deserve in the first place.
A true hero's tale - a journey of sacrifice, acceptance, and growth!