Is there a possibility that those 2 can marry again or is it gone for good?

I feel my brother is telling me to make sure I give a cash gift to cover the cost of my, my spouse's and our son's plates. I don't know if he's telling all of our sisters and brothers but I feel it's tacky. Also one of my sister's gave my niece a very expensive engagement gift and my brother made a point of telling me the cost based on what he saw it going for online. I gave my niece a gift card for her engagement which is not even close to the amount my sister spent on her gift. In addition I just spent a nice amount on baking pans, muffin pan, and mixing bowls for my niece's bridal shower. I feel it's tacky to ask people how much they paid for something unless you're offering to pay for it. Am I wrong about all of this.