You can fast on behalf of your parents for any days of Ramadan or obligatory fasting which they have missed.

As for reciting Quran:

Kindly refer to the following link(s):

https://www.youtube.com/watch?v=S5xWzf8NoFg

You can make Duaa, ask Allah for forgiveness, give charity and appoint
someone to make Umrah or hajj on their behalf.

My parents are dead can I fast for them and also can I read QURAN for them?

Fasting | June 8, 2017 12:37 am
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Is the below authentic 1. Give one Pound in charity every night of last ten days of ramdan, so if it falls on lailatul qadar it’s as if you gave charity everyday for 84 years. 2. Pray two ra’kaat every night, so if it falls on lailatul qadar it’s as if u prayed everyday for 84 years. 3. Read Surah ikhlaas three times a night, so if it falls on lailatul qadar it’s read the whole Quran 84Years