Do you have a sling you can nurse in? Yes, I have four but can only find three. Just can't get it so they are both feeding. I have two front carriers and one that I made myself. The kids tend to be half in it and half out of the homemade one.
Have you thought about using a supplemental nursing system for the formula? Don't know much about it. Never gave it much thought. I know what it is, but never really saw much use to it.
Will your babies take sippy cups for the formula yet? Sippy cups don't work with my kids. They'll play with it, but won't drink from it.
Have you created a hands free pumping setup with an old bra? Yeah, but can never find it. I have about two or three.
Does MIL help at all after work? If she does, I don't notice it. Sometimes I will, but VERY RARELY.
Could you work something out where you let the chores slide while she's at work and then she watches the kids for a tiny bit when she gets home so you can catch up?
Tried something similar, but it didn't do to well. Most of the time she comes home and does her own bit. Rarely talks to me, unless it is something she deems is important.
We have a VERY bland relationship.