Hello, Ana.
My name is Lena.
I would like to tell you about Russian names.
We usually have full form name and short form name.
Full name used in more official situations.
In our passports written full name.
And short name use our parents and friends, but sometimes they can use full name, when they serious or maybe angry.
For example, my full name is Elena and my short name is Lena, my boyfriend's name is Dmitrii or Dima.
So names your daughters' are Margarida and Rita, but in Russia it's almost the same name: full form is Margarita and short form is Rita.
It's funny, I think.
How different the world!
Greeting you and your daughters from Russia.