Dad of 2 girls (15 & 14).

I also took on bath & bed time for both of my kids from birth, and kind of still do from a scheduling/management perspective. My wife also is at wit's end by the end of the day from dealing with kids (she teaches middle school) and has no more patience for kids by bed & bath time.

We also have had fosters and I completely understand some folks suggestion of removing yourself from any bath/bed duties. In your case, this little girl is not just a foster daughter, but a blood niece as well. As such, I wouldn't hesitate to do whatever you need to do to handle business in your home. Yes, there is always a chance of false claims being made, but the same could be made about your wife, by our own biological children, or anyone really.

Keep up the good work, Dad. From here we'll be praying for your wisdom & discernment, your wife's patience, and the little gal's compliance. Thank you for stepping up for the kid.