Human being has a body and a soul. Soul is the one whom he represents/feels by staying in a temporary body. In india, after the death of someone, they call him though prayer for offering. They call to whom ? The soul, soul of the person who died. They know that soul is that person whom they knew when he was in that body. Now body is not there. But they know soul is still there.
There is a custom to call the soul to offer him worldly things or give him message or peace. In Hindu family, they have the custom of calling them every year and offer them peace/prayer. Who comes ? If soul is free, it will come !
So Every human being has a body and a soul. He has two fathers, the father of the body and the father of the soul. i.e. physical father and spiritual father.
Father of the body we understand. The father of the soul is the "ParamAtma". We all know our ParamAtma father. We pray him telling "O God, the Father! O Supreme Father, Supreme Soul". We also know that he is the creator of "I" the soul. So we never forget him. The past memory reminds us that "Parampita Paramatma is the creator".
Our soul is Nirakar. Similarly God is Nirakar. Nirakar father created the nirakar soul. His name is "ParamPita" or "Supreme soul" because father stays in Supreme place or Paramdham. "Supreme place" means the place which is very higher in place from us. So when we talk about "ParamAtma", we automatically look upwards to find him.
Definition of निराकार
वि० [सं० निर्–आकार, ब० स०] १. जिसका कोई आकार न हो। आकार-रहित। २. कुरूप। बेडौल। भद्दा। पुं० १. ब्रह्म। २. विष्णु। ३. शिव। ४. आकाश
[Source: Pustak org]