Study the following information carefully and answer the question given below it:

Garv is the son of Sashi. Hari is the father of Manu. Garv is married to Devi. Garv and Manu are siblings. Prem is the brother of Devi. Sashi has only one son. Rakesh is the son of Garv. Prem is the father of Karan. Janvi is the daughter of Manu. Prem has no daughters.

How many married couples are there in the family?