ANSWER:

You MUST seek your parents forgiveness as well. 

Make a lot of dua for the deceased parent besides repenting to Allah for this major sin. 

Disobeying Parents is a Major sin. If I feel I disobeyed my parents in Past but repent for it to Allah Swt, is that Sufficient enough? Or need to ask forgiveness to parents too? What if one of my Parent passed away? But I am really Sorry whatever I did in past?

Fiqh of the family | January 1, 2019 8:04 pm
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I have an abusive father who is destroying my life since childhood. I’m not an emotional person. Now he is throwing me away out of his life. If he dies is it obligatory on his only son(me) to arrange everything(e.g.. his funeral)? I know Allah loves kindness but I can’t do it with this man. Please pardon me & just let me know is it ok if I manage anyone else to arrange everything like funeral etc?
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My question is very old lady who comes every Thursday to our house for begging food or anything to eat so I give her without my parents knowing is that call sadaqah and will I be rewarded for that and my parents too because the lady is not a Muslim Or I am a sinner for not telling my parents that I’m giving food without them knowing.