How can one reconcile the feeling of aversion towards one's father with showing him dutifulness, especially with the existence of Quranic verses such as: (And accompany them in [this] world with appropriate kindness) and (Allah does not charge a soul except [with that within] its capacity)?

Marrying more than one woman is not a sin in itself, and accusing one's father of indecency without clear proof is not permissible. It is obligatory to honor one's father, treat him with kindness, and obey him in what is good, without mistreating him or treating him harshly. If he is obeyed, then disliking him does no harm, but one should not succumb to feelings of hatred and should look at the good aspects of his character.