K.B.
You could take them a plant or small tree (not flowers)-something that would continue living if taken care of properly. Also, money in an envelope along with a hearfelt letter or nice card is always nice too. More importantly is a month or two after the funeral etc. a lot of people forget about the deceased or deceased's family. It would be nice to give bring them over dinner then or take his wife or other family members out for dinner or breakfast and let them talk through their grief or feelings or even invite them over for a meal.