I am going to reply with something to the effect of:
W, I understand that you need me to take leave in order for you to go on the business trip. I do not want to take my leave for that purpose. As your H I would have done this every time; however since I’ve been fired from that role I do not want to use my leave to serve your needs. Thank you, H
Good; bad; otherwise? I do not want to take leave to babysit, I don’t want this to set any precedent for that going forward, and I don’t want to upset the apple cart.
She wouldn’t offer 10 days with the kids to me if I asked; this is strictly to meet her needs of babysitting without having to burden her family and friends for 10 days. I’m not her babysitter, and I certainly don’t want to spend 33% of my leave days to meet her timeline.
Me40; W38; S12; D9 BD11/19/2018 D filed 12/20/18 D Final 7/2020 Being the best example I know how for my kids to see.