Why is 'Putra Devobhava' not included in this Shloka of Taittiriiyopanishad?

[Shri Bharath Krishna asked: We all know the Shlokam, "Mātṛdevo bhava, Pitṛ Devo bhava, Ācārya Devo bhava, Atithi Devo Bhava". When I searched about this Shloka's source in Internet, I learned that it is from "Taittiriiyopanishad" scripture. I hope it is correct that this Shloka is from the Upanishad. If it is so, why is "Putra Devobhava" not included in this particular Shloka Swami? Can You please explain me?]

Swami Replied:- How can one worship the issues like angels? Even though external worship of issues is absent, from the point of real love or blind madness, the parents worship their issues more than God. Gopikas knowing that Krishna is God, complained to Yashodaa (His mother) regarding stealing of their butter by Krishna, which was stored for their issues. Except the twelve Gopikas, all the Gopikas failed in this test by giving more importance to their issues than to God.

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