In 1 John 1:7 it says, and the blood of His son, showing he has been talking about the Father. The God, and Father of the son. Here I think this is the only way I can show you...
1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life (we will see he is not referring to the person Jesus because it was manifested in Christ, meaning Jesus displayed it, but it was God the Father they were seeing, while it was Jesus they looked upon, heard, and handled, John is referring to that life, that word of truth, that was displayed); 2 (For the life was manifested (in Jesus), and we have seen it, and bear witness, and shew unto you that eternal life (now obviously, as you can see, he is not showing us Jesus, because Jesus is now in heaven, he is showing us the truth, that dwelt in Christ, as he will tell us, this is what they heard from Jesus (verse 5), seen, and handled, and that truth is that God is light, and in him is no darkness at all, which he will tell us starting from verse 5), which was with the Father (true life), and was manifested unto us (in Jesus)); 3 That which we have seen and heard declare we unto you (they not only heard the truth, but seen the truth action, they seen the expression of God the Father in flesh, in Jesus), that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ (yes our fellowship is with the disciples, and the Father, and son, if we walk in the truth, notice no mention of the Holy Spirit, but also notice this also defines for us the Father and son, because verse 7 is going to reveal the 'God” John has been talking about from verse 5 to verse 7). 4 And these things write we unto you, that your joy may be full. 5 This then is the message which we have heard of him (Jesus, who spoke to them about the Father, that was in heaven, in the Gospels), and declare unto you, that God (now I can show God is the light from N/T, and O/T, even from this passage it can be seen) is light, and in him (Father, is truth, and in Him there is no lie, for He is love) is no darkness at all. 6 If we say that we have fellowship with him (Father, if we follow the flow of whats written, we will see, John is talking about no one else, but the Father because it's only the Father that has a son Jesus, not unless you now want to say, the Son is the Son, of the Son, because the Holy Spirit is not even mentioned), and walk in darkness, we lie, and do not the truth (darkness here is the lie, light is truth, if we don't do the truth, we believe a lie): 7 But if we walk in the light, as he (Father, has to be, because he has a son Jesus Christ...) is in the light, we have fellowship one with another, and the blood of Jesus Christ his (Father's) Son cleanseth us from all sin.