We have the reminder that love is not merely spoken, it is meant to be lived. This gives us clarity for the scripture that even flawed people naturally love children because the instinct we feel comes from God himself.
If a father is though imperfect, know how to give good things, how much more than our Father who which is both in Jesus, in just, which is both the just and unjust. What is important here is the emphasis on character over just that argument.
The Bible does not only encourage us to read many words, but it wants us to be consistent, to embrace good behaviour. As 1 Peter 3 says, the heart can be won with that word, but two conducts. This principle applies not only to marriage but to families and broken relationships.
The reality is this that when parents tend to reduce love for their parents, it contradicts both that of nature and instinct. The solution must not be the brothers, the teaching call us to examine our self, our action on reflecting, Father who is kind, because in the end it is our manner of life that matters. This is what speaks loudest and has the power to heal relationships and keep winning hearts.
Stay Blessed.