Get the in-laws to cook/clean/wash up/entertain your toddler/laundry.
My MIL came and stayed for a week when DH went back to work. I plonked myself on the couch each morning at 6.30am in just a singlet/shorts and put DD on my chest with a boob out. she fed on/off whilst I watched TV. I only took her off to shower or to pee. If I wanted a nap I'd give her to MIL after the housework was done.
In your case as FIL is around too, you might want to set up your bedroom as a feed zone. Get lots of DVDs, laptop, books +/- TV and park yourself there with your bub. Confirm with your hubby how he is to show his parents that the rest of the house is their job.
DO NOT cook/clean up for anybody. if you have to order in each day takeaway then do it. Maybe pre-cook/freeze some foods you know your DD loves so that even if you adults are eating lots of takeaway or having late meals your DD gets fed. Get hubby to pick up groceries on way home from work. Is your toddler at daycare? if so then make sure MIL/FIL are allowed to pick up/drop off - write down your DD's routine and stick it up on the fridge/pantry/toilet door. Get them into your DD's routine as in playgroup/library etc. Most grandparents love spending alone time with the grandkids. yes your DD might pick up some habits that isnt to your liking but deal with it later.
I'm due with #2 in 4 weeks and my MIL is flying up to spend 2 weeks with me post birth. I've starting cooking/freezing small amounts of food for DD as well as larger containers for us. I've stocked the pantry with all of DD's favs, bought the toy doll that the new baby will give her. MIL was up last week and was shown how to sign in/out at daycare, where playgroup is, library etc . My DD also was totally looked after MIL for a couple of days so they are both comfy with each other.
Good luck and you are allowed to lay down the rules.
ps. make sure you eat heaps and drink much more water... BF takes a lot of nutrients/water and dont worry bout losing baby weight till after 3mths.