Bright, People do not understand how divorce can create grief. People think grief only applies to someone passing away. We each have gone through the grieving process and it takes time. Each person moves through the stages in their own time. Right now, you are still experiencing anger. Feel that anger and let it go.
Your family only wants what is best for you and they think a divorce is the answer. Nothing will change for a long time because no matter what, you still have to go through the grieving process.
As for sending a card to the upcoming bridge/groom. I would hold off on that unless you were sent an announcement/invitation. Wait until the ceremony has taken place and if you still want to send something, then do it. Even though you are being very thoughtful in thinking of sending a card, to them, it might look like you are angling for an invitation. Just my two cents.
Be kind to yourself. You can't rush the grieving process and please don't allow others to convince you that you can.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
