Sympathy Card Software Sympathy Card When You Do Not Know The Deceased?

Sympathy Card when you do not know the deceased? - sympathy card software

The grandfather of my friend died today. My immediate instinct, because of what I am is in my family there, a condolence card to send his family) (father, brother, mother and son. However, to see, because we are a long distance to their father only rarely and only on holidays. I met his mother's family once, and yet I have not met his grandfather, because he is in palliative care for years. Is it appropriate to send a card? If so, what can I say: I do not know the deceased?