Surrender To Whom?

In Japuji Sahib, Baba Nanak says:
           "Hukam rajaayi chalnaa Nanak likheya naal"
            "Live - walk the way according to the Hukam".

Naturally, a question comes to mind - Whose Hukam?
Everyone says their hukam should be obeyed. 
Mother says: "I gave you birth - I brought you into this world bearing great pains and sufferings - 
I raised you up with great sacrifice  - so, you must obey me.
Father says he worked hard and sacrificed his desires for the sake of children, so he should be obeyed.
Children claim that times have changed. Now they are earning and taking care of them so the parents should listen to them.
Similarly; elders, teachers, priests, leaders, rulers, officers etc. all claim it's their right to command and everyone else should listen to them.
So, to live a pious, truthful life - Whose Hukam should be followed and obeyed? 
To whom should we surrender? 
Baba Nanak clarifies it in the next verses:

               "Hukmee hovan aakaar - hukam na kahiaa jaai
                Hukmee hovan jeea - hukam milai vadiaayi
                Hukamee uttam neech - hukam likh dukh sukh paayieh
                Iknaa hukamee bakhseesh - ik hukamee sadaa bhavaaiyeh
                Hukmai andar sabh ko - baahar hukam na koye 
                Nanak hukmai jay bujhai ta houmai kahai na koye"  

By the Hukam, bodies (universe - earth and heavenly bodies such as sun and stars) are created; 

The Hukam cannot be described (How and why these were created) By the Hukam, souls come into being; 
by the Hukam, glory, and greatness are obtained (by certain species). 
By the Command, the Hukam - some (life forms) are high and some are low; by the written command - the set order, pain, and pleasure are obtained**.  
Some, by the Hukam - the Command - are blessed; while others, wander aimlessly forever.   
Everyone is subject to the Hukam - the Command; no one is beyond the set Order.  
O Nanak, one who understands the Hukam; the Order, does not speak in ego - his egoism dies of itself.

In other words, all Spiritual Scholars, teachers, and Gurus have always been talking about following the natural Order of Nature, Universe, God, Super Consciousness - or whatever name you want to use. 
                   "करन कारन प्रभ एक है - दूसर नाहीं  कोइ 
                    नानक तिस बलिहारने जल थल महियल सोइ"            
                     Karn kaaran Prabh ek hai - Dusar nahi koi
                     Nanak tis baliharne jal thall mahial Soi"
There is only one creator and the cause (of creation) - No one else.
O Nanak - worship the one who is present in water and soil - everything and everywhere.

                   एको सिमरो नानका जो जल थल रिहा समाए 
                   दूजा काहे सिमरिए जो जम्मे ते मर जाए 
                  Eko Simro Nanakaa jo jal thal reha samaaye
                  Doojaa kaahay simariye jo jammay tay mar jaaye
"O Nanak, worship the ONE immortal who is everywhere -
Who is present in every fragment of water and soil.
Why worship the other (mortal) who borns and then dies"

Therefore, when the Holy Scriptures say: "Surrender and walk the path of Hukam - they are talking about surrendering to the One Almighty, Immortal Lord - not any mortal physical beings. 
                             'Rajan Sachdeva'