Honestly? I think its okay to focus your energy more on yourself and your newborn rather than doing this. I think its lovely that you would think of these mothers, but this is the time for the dads/husbands to take responsibility for Mothers day, not you. You are not open the couple of weeks prior to the day and you are not open the day of. Not for vacation but because you will be giving birth to your child. You are already taking an insanely short time off and the families should just be greatful of that. If you keep doing things like this, you are just setting yourself up with these parents who will have this high expectation of you which wont leave any room for down days when you just aren't able to live up to these standards. It's okay to have downtime, and in your case, for very good cause. IMO I would scrap the idea of doing this and better invest my time and energy to my families needs at this time.