Low strandard set for respect by parent's relationship

My mum worked so hard in the family business, to this day she still ask dad for money, she is dad other half and was dad driving force in the business towards the end but was treated like a farm worker.

Dad 12 years older then mum he was struggling with the work on the vineyard, mum kept it going it's the only career she knew for her married life in the middle of nowhere that she had signed up for after marriage when she landed in Australia, knew nothing better.

Mum in a few ways was too good for dad,  she let him walk over us without talking back. Mum not like Dad's ex wife.

Mum was a teacher in India, we had a car accident in December 2014.

Dad made her feel so guilty about it, instead of being a supportive and understanding husband.

Mum lost her bother a few months later.

Dad is just ruthless to see other people pain.