Hi... Marriages are difficult and sometimes they reach to a place where partners become extremely toxic and adamant on their toxic ways.
As a kid it can be really exhaustive and consuming but you need to draw a line between your parental relationship with them and their own marital relationship.
You have no role to play between them. The best you can do is to create a better life for yourself and offer resources to help them go through their old age a little more respectfully.
Next Steps
Seek professional help.
Interpersonal Relationship Counselling is required.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: Nine Six Seven One Three Zero Three One Three Four (whatsapp)
Website:https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cll