I would just tell them you won't be open until you get back. I am like you, I bend over backwards to be open for my families. I realize that me not being open affects multiple people. I rarely take days off or sick days, I have my mother-in-law who is my backup for short periods of time that I need to be away but she won't do a full day. I post my days off usually a minimum of 4 months in advance (my contract says 1 month is required). My contract states everyone should have a back up. I have 1 parent who doesn't have a backup. She gave me grief once for closing due to me being sick. She thought my MIL should watch the kids all day. UMMMM....not going to happen. How would I rest with a house full of kids. If you need time off - take what you need. Don't feel bad if they go elsewhere.