A dream about cards

Me and a few other people, most of which I don't know in reality, are playing a card game.

The cards have both a drawing and a written explanation on them, and each card also have it's value in money printed on. Each card have an object or an animal or a person or a plant on it, the purpose of the game is to swap cards with the other opponents and get 4 cards that are the closest topic wise (like 4 "animals" cards, or 4 "fishes" cards) while also trying to get the higher value cards in the series you build.

The game is both a game and a divination, the texts and images on the cards and the series the player are supposed to say something about the players and lives them advice about the future.

I have landed into the game from a different part of the dream, and both me and another character (Ned maybe) have to get into it even though we don't understand the rules and don't even know what cards we are holding. I'm starting to look at my cards and to my surprise, they are, even though I have yet to start swapping, really good, I have 2 dog cards (one of them is a sharpay) and one bird card (I think it was an owl). As far as the game goes, I can maybe cash out on the "Animals" series, or go on playing and try to rank higher with the "Dogs" series, it all depend on what my last card is.

When I reach for it, I realize it's not a card at all, but a folded letter that was folded into a card size. I know, in the dream, that I got the letter over 2 years ago, but never read it, I open it to discover a lot of photos of this one girl who I've never met before. When I read the letter, this girl who wrote it is sharing with me the fact that she just discovered she was adopted and decided to seek her biological parents. She found them and was amazed to see the physical similarities and now she lives with her biological family trying to catch up on a whole life of not knowing one another.

I remember that the reason why I did not respond or read the letter was that I though it was vain to include so many photos, but finally reading it, I realize that the photos are half of her and half of her mom when she was young and that the mass of photos wasn't about vanity, but about showing me the family similarity. I try to think if there's a way I can still answer it but I know it's just too late.