Female half of a poly couple here. My hubby of seven years and I have recently welcomed Angie (a 25 year old woman) into our marriage. We have a very busy household with our 2 small children (3 and 5 year old boys). Angie is now expecting my hubby's first child. We are all excited about her pregnancy. She is now 7 months and hubby is very excited for sure. How do others tell their existing children about the impending arrival??