The biggest red flag for both families for me is why do they need care so suddenly. Here families interview at least a couple months before needing care and some more. A family needing immediate care would need to explain to me why with the idea of they are just a terrible procrastinating family - expect them to never bring anything on time so ask for diapers a month in advance, was grandma going to look after them and changed their mind, are they on a wait list for a daycare centre but not in yet that is the most common one around here meaning they are gone at a moment's notice. I would want to know why I am the back up plan for sure.

For family B I personally don't think she should be expected to pay anything to hold the space for three weeks. It is normal to interview at least a month in advance and thoset three weeks will be used for transition so I would only be charging her for those days. It is like you are goading her into paying - pay up or I will take baby A instead. Loss of income is not baby B's problem if you choose them.

For baby B why they are out of the country might be an issue if it was something that was going to happen frequently to make sure family knew they would have to pay regardless of attendance.

Do be aware that there is always the possibility of turning down baby A only to find by the time they get to the interview stage that baby B no longer needs care because they found someone else in the meantime.