It's part of knowing the heart of God...
And "context"...? It's a pretty simple question...? But, I'll try again (and try to make it even simpler)...?
Is YHWH/Jehovah God, is he who you atypically think is the Father God, or not...?
God Bless!
It is only easy when you frame the question in the context your definitions. Given your definitions might not be correct, it may be impossible for people to answer.
Here is a question:
How is it possible to win an NFL game 1 to 0? Very simple question. Can you answer this? Only a person with different scoring rules where it is possible to score 1 point can answer this question. So definitions and context do matter.
So lets discuss the context of your question. Are we suggesting that God in the OT is the Father of the NT?
Depends if you hold that Son had issued forth from the God in the OT. Simple in that to be a father one has to have at least 1 child. And to be a child, one has to have exactly 1 father.
I do hold this to be true. I hold that the Son had issued forth from the God therefore God became a Father prior to Adam. This happened before creation as the initial act of creation. The Son issuing forth from the Father was the first act of creation.
The Son came out of the Father... much like a child coming out of a mother. Birth.
We understand that a child is in and has always been in the "bowels" of the parent. God was not a Father until the Son came forth out of the Father. But the Son was always in there, just as you and I were in the bowels of Adam all those thousands of years ago. I am a gardener. We have processes where we take cuttings from a plant and use that cutting to bring forth new plants. "New" only in the context that they are physically separate from the original. But genetically they are identical. The Son is and was genetically identical from the Father. In the process of cellular division, it is impossible to tell the difference between the child cell and the parent cell. We use these terms because that is how we understand reproduction.. but biologically... you cannot tell which cell is the first and which cell is the second. They are identical. There is no parent cell and child cell. They are identical. You can only begin to differentiate the two as they process and assume different roles and perform differing actions.
There is evidence in the OT language that the Son issued forth from the "womb" of the Father. They were there together all along... but the Father-Son meaning did not coming into being until that moment when the Son came forth out of the Father.
All of this is opened up clearly and concisely with hundreds of scriptures and proofs in the book "A Revelation of Who Jesus Is."