A young woman lost her job and can't pay the rent anymore.  She got a offer to prevent getting homeless by pretending to be  the offerers girlfriend.  He doesn't know she has a child. Despite of her doubt she agrees and  goes to the address where the offerers brothers and father run a restaurant. The offerer is the eldest of three sons and left the household.  The second brother is sceptical about  her story but their father let them stay hoping for return of the lost son.  He also thinks of the boy as his own grandchild. She starts working in the restaurant and  doing chores.

After the lie got revealed the second brother kicked them out. But there are already feelings for the two freeloaders.  Everyone cares in its own way for the girl and her boy. As the time flows the two brothers fall in love with her and think about adopting her child. On the other hand the father kidnaps his grandson from school to spend time with him.

Sorry, just remembered it is 

Love Actually (2012)