I know my dad got some of his traits from his mother and father. Their 'neglect' is also likely a reason for his emotional problems. My dad and his brother were raised by their stepdad and their much younger half sister was very much the favourite and golden child.
The long story of my grandparents:
TRIGGER WARNING
My grandma was hungarian. She was also royalty technically. Her mum received a royalty pension (Austrian royal family). She was abused as a child, her mother would deliberately send her to men as a little girl for favours.
She met a man, married and had a baby. He was jewish. Her sister sold them out to the nazis and he was taken away, never to be seen again.
She met another man. He refused to raise another man's child. He forced her to send away her child, she gave him to her sister. They had two boys together. My uncle and then my dad. When my grandma was pregnant, he was in a motorcycle crash. When he realised that he wasn't going to make it, he tried to get someone to kill my grandma so she wouldn't live without him (yup this man is my biological grandfather). He didn't succeed. She remarried again, had a girl. This man, my grandpa, was wealthy and very opposed to communism. Unfortunately during the russian takeover he was a big enemy of russia and so they had to flee. They came to Australia and worked hard until they passed away (Oldest child stayed in Hungary with aunt).
My grandma was mean, arrogant and strong-willed (example she would constantly say she should just kill herself when someone wouldn't do what she wanted). I never enjoyed being around her, I don't think she ever hugged me or showed affection (she also didn't speak good english) but she went through so much that I really can't judge her. My dad treated her like a toddler, he made demands and she had to follow. She had zero control.
My dad and my uncle are not nice people. They were both extremely arrogant, stubborn with severe emotional issues and a superiority complex. My uncle passed away recently (his funeral was the exact day my baby girl was born in February). I don't think my dad and uncle were treated very well growing up. No affection or love so I guess that's why they could never show affection, also likely the genetics from their pos father. Overall I just feel really sorry for all of them, but I can't give up my happiness (and my kids) to try and make my dad happy.