Ptquilts makes a good point. When was the last time you received a thank you note in the mail? Not email or text...maybe I'm wrong and I hope I am. Why do I think the happy couple won't put away all the money the get? Why do I think it will go to disposable diapers? I think it is totally disengenuous to ask for money for a house, no matter how clever the poem. I would feel a lot better it they just said they're pregnant, have few resources, and would prefer money to gifts. Done. I might be inclined to give them some money. Otherwise, not so much. You are very generous to attend the ceremony and to give them any money.