Tomorrow morning, they are going to receive the nice gifts from Father SantaSanta Claus. Tomorrow morning, they are going to receive gifts from Santa Claus.

It's a bit weird calling "Father Santa" because it sounds stiff. Santa could also suffice. (Or maybe you mean yourself lol)

Tomorrow morning, they are going to receive the nice gifts from Father SantaSanta. / Tomorrow morning, they are going to receive nice gifts from Santa Claus. Tomorrow morning, they are going to receive nice gifts from Santa. / Tomorrow morning, they are going to receive nice gifts from Santa Claus.

Christmas eEve Christmas Eve

Because all of my coworkers worked hard, we were able to workget off on time. Because all of my coworkers worked hard, we were able to get off on time.

Could also be "get off work on time," "finish work early," or "get home early."

Because all of my coworkers worked hard, we were able to get off work off on time. Because all of my coworkers worked hard, we were able to get off work on time.

We have a steake, a pizza, a pasta, and some donuts. We have steak, pizza, pasta, and some donuts.

No need to add "a" when enumerating food unless you're stating a definite amount.

We have aare having steake, a pizza, a pasta and some donuts. We are having steak, pizza, pasta and some donuts.

WithI and my sons, we set many decorated lights on the Christmas tree and on the walls. I and my sons decorated lights on the Christmas tree and on the walls.

With my sons, weMy sons and I set many lights on the Christmas tree and on the walls. / I set many lights on the Christmas tree and on the walls with my sons. My sons and I set many lights on the Christmas tree and on the walls. / I set many lights on the Christmas tree and on the walls with my sons.