1) I AM THE FIRST SON OF MY FATHER OR I WAS THE FIRST SON OF MY FATHER. 2) BOTH OF THEM ARE COMING HOME NOW OR BOTH OF THEM WERE COMING HOME NOW.THANKS IN ADVANCE

abuyus:
1) I AM THE FIRST SON OF MY FATHER OR I WAS THE FIRST SON OF MY FATHER. 2) BOTH OF THEM ARE COMING HOME NOW OR BOTH OF THEM WERE COMING HOME NOW.THANKS IN ADVANCE

I am the first son of my father.

Was is a verb. A first-person singular simple past indicative of be.
And a third-person singular simple past indicative of be.

The second question is too dumb.
The correct answer is the first one.

Were is a second-person singular and simple past indicative of be

Example
John, you were the only person to see him.
It is also a first or second/third-person plural simple past indicative of be.

How can you say both of them were coming home now??