I know God is not the greatest for an individual. There are some other persons who are even greater than God Himself like: Guru, Father and Mother. All three are considered greater than God.
As per my knowledge which I learned from TV serial Devo ke Dev Mahadev. In one of its episode when Shiva first meets Ganesha then He asks Ganesh that What you know about importance of Father and Mother. Then Shree Ganesh replied, my Mother told me that 3 persons matter the most in life. They are Guru, Father and Mother. Guru is greater than God Himself because God gives us life but Guru is the one who makes this life meaningful by educating us.
[ As per my understanding by these wordings, it's same as the mother who raises us is greater than the mother who gives birth to us. Here God gives birth but Guru helps us to raise our knowledge so that we can make this life successful. So Guru is greater than God. ]
But, As per the serial: Father is even greater than Guru. One father is consider as equal to 100 Gurus. But Mother's place is even higher than Father, Even greatness of 100 fathers can't match the greatness of single Mother. Hence Mother is greater than all.
So this was Shree Ganesh's reply to Mahadev's question. As per this message, no one is greater than mother. And no service (seva) is greater than Mother's service (seva). That's why it is used to say that heaven is situated in mother's feet. This means one can easily get heaven if he gives his services to Mother's feet.
But one said to me that as per shastras, Guru is greater than all. This message of him is directly conflicting with my understanding.
So who is the greatest? A Mother Or A Guru?
UPDATE
I am getting some different kind of answer. So let me ask with an example.
As per Great Saint Kabir....
गुरू गोविन्द दोऊ खड़े, काके लागूं पांय।
बलिहारी गुरू अपने गोविन्द दियो बताय।।
Means If Guru and Lord both is standing in front of you then whose feet you will touch first? In that case as per Saint Kabir, we must do pranam to Guru first, after Guru we should bow in front of lord. And What I am asking is, If Mother and Guru is standing in front of you then one should do pranam to whom first? What you suggest on this?