Please help me find the right words

[~Trish~]

My close friend (who is 24 weeks pg) came to visit me yesterday and told me her sister just lost her baby boy at 33 weeks . We hugged and cried together, I am just so devastated for them .

I would like to send her sister and DH a card to express my sadness, but I'm unsure on what would be appropriate. I need some help if possible. I don't want to send a sympathy card, what would be an appropriate card to send? A "Thinking of you" card? I also need help with what to write in the card. How do you express your sadness while acknowledging their DS in a sensitive way? I'm so scared I'll say the wrong thing! I don't want to be one of those people who doesn't know what to say, so doesn't say anything at all. I think it's important to have your child acknowledged and to know others are thinking of you.

I'd really appreciate if someone could help me find the right words.