It doesn't matter if they can afford the full time spot or not. Why are you taking a cut in pay to accommodate them? Honestly if you don't want to deal with it just tell them you need to fill the spot with full time as a business. Then the ball is in their court - full time or they pull him. Either way will help. Boy will get into routine if full time or be gone. Win win. Don't worry about the baby possibly coming. Families come and go and you have to look after you.