La madrastra estadounidense de paulo y raúl visita hoy a sus hijos en el departamento de sus abuelos. hoy es el cumpleaños de paulo y raúl, ellos son gemelos. la madrastra cocina papas con pollo para la celebración

The correct translation for this exercise is:

The American Step-mother of Paulo and Raul visits her sons in their grandparent's apartment. Today is Paulo´s and Raul´s birthday, they are twins. The step-mother cooks potatoes with chicken to the celebration.

Explanation:

Let's analyze the text to find everything we need to translate it.

The American Step-mother of Paulo and Raul visits her sons in their grandparent's apartment. Today is Paulo´s and Raul´s birthday, they are twins. The step-mother cooks potatoes with chicken to the celebration.

There is a key language used in this text and I am going to explain it to you:

American means estadounindense.

Step-mother is madrastra.

To talk about someone else's object instead of the usage of “his” or “her” in Spanish it is employed “su” el departamento de su, el coche de su.

Cumpleaños is the birthday. It’s not translated as the day the were born but as the day hey mark year of life.

Gemelos means twins.

And celebración is a celebration.