Hello from America, Roberto!

today afternoon it was raining day and my family and my sister's family went on shopping center. 

It rained this afternoon so my family and my sister's family went to the mall.

In the shopping center there were many people.

There were many people there.

We saw shop windows when our children were playing, then, we came back home.

We window shopped while our children played. Then we came back home.

"To window shop" is to fare una passeggiata while you look at store windows. :-)

Shopping center

Hi,
today's afternoon was a rainy day and my family and my sister's family went to the shopping center.
there was a lot of people In the shopping center(IT WOULD BE BETTER TO USE IT INSTEAD OF SHOPPING CENTER) there were many people.
We were watching shop's windows since our children were playing, then, we came back home.