Sibling theme, Cards, product type: Moments Cards, product class: Message Cards

Message cards is an activity that can be used for different purposes. Guests can be asked to write messages as per theme. Some instructions according to theme. It could be well-wish messages.
These cards could be collected by host. Collected cards could be read by host, by writer or some other guest. In case of birthday these could be messages/instructions which can be kept by host and given to intended person like birthday boy/girl one each on his/her next birthdays.