Answer:
The letter:
Step-by-step explanation:
Dear, Sister
Congratulations on your new baby's birth. I'm overjoyed to learn that you have a tiny angel in your midst. While I recognize that every child is a blessing, I would suggest you to hold off on giving me any more nieces or nephews until you are confident that you can offer the finest possible care for each of them, You already have four adorable kids! Congratulations once more, and best wishes for a successful recovery, I'll pay you a visit as soon as I'm able to see my new niece or nephew!
Sincerely, Your loving Brother/Sister