Tathagata vs disciple: taking the Buddha as Father, Dhamma as Mother

Disciples of the noble ones are supposed to take the Buddha as the role of the Father, and Dhamma as Mother. When a disciple attains full liberation, completes the path to self-enlightenment, becomes a Buddha/Tathagata, does he become his own Father and his own word becomes his own Mother? Specially: did Gotama Sakyamuni take himself as Father and his own speech as Mother? and would all of his arahants be expected to do the same, or keep the Boddhisatta and his Word as Father-Mother? Also maybe, how about the disciples committed to the (Mahayana) bodhisattva vows?