Puts the ball in your sibling’s court without being too dramatic or accusatory. You start and end with the positives (reword to suit) and avoid putting them on the defensive or escalating the argument.
Always send handwritten notes. Regardless how brief, a handwritten note (as opposed to a preprinted one) illustrates sincerity and your appreciation for the gift.
Writing a thank you card to people is something that most people will not do or just leave it up to someone that is willing to do it. But there are others out there that is willing to do it and they even hand write something for all the people that give them something or just came out of care for that person.
There are many different ways and reasons one would sent a thank you card. Most people would think that thank you cards are only sent for wedding gifts and so on. But you could send thank you cards for birthdays, graduation,weddings, engagement parties etc. There is no limit to sending out thank you cards to people that came for something at your house or where ever.
It is not really hard to find free engagement party invitations. You only have to check out with the best engagement party planning web sites. They are definitely going to know about some of the best deals in town.