Is excessive supplication for the deceased, to the extent that it affects studies and family relationships, and is preferred over obedience to one's mother, Islamically permissible?

Supplicating for a deceased father should be a simple supplication, free from hardship, combining filial piety towards the father with obedience to the mother. This can be done by supplicating for him during prostration (sujud) or after prayers in the mosque or at home. This is sufficient to honor the father and fulfill the promise without wasting time or disrupting daily tasks.