Your late wife must have been a good lady for you to continue to remember her. Yes, of course you can do dua and pray for her forgiveness, as long as she was not hostile to Islam and she knew no better.
It is not obligatory on non Baligh child to seek forgiveness for acts committed by him during his childhood. It is good to seek forgiveness from them if you can. It is also good to pray to Allah to forgive you and them as well.
Allah (SWT) is The Forgiver. The Prophet (SAWA) and Ahlul Bayt (AS) taught us to supplicate to Allah: O Allah, who no one forgives sins but He يا من لا يغفر الذنب إلا هو
This part of Du'a Jawshan al-Kabeer which we recite during month of Ramadhan and other occasions.
We seek the Shafa'ah (intercession) from the Prophet (SAWA) and Ahlul Bayt (AS) to Allah (SWT) to forgive our sins.
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