Sometimes all we can do is just be there. Doesnt mean that we be door mats though.
When my husband's dad died... he was a real a-hole. For like a year. His dad died when I was pregnant,suddenly. I know.it was tough for him but eventually I said ENOUGH. I told him Im sorry he lost his dad but I needed him on planet earth with me and so do the kids! Took a bit of work but he eventually saw the light.
Unless "taking it out on you" means physically I urge you to try and work on it. Honesty,communication and dedication are key. This is just one woman's advice, you haven't mentioned any specifics so I can't know for sure how bad it is. Good luck to you! <3
If u feel ur not getting the support u deserve..remove urself from the situation.. You have to focus on ur babies being pregnant is a lot of work and I can't even imagine what's it's like being pregnant with twins... Remember ur babies feel and go through everything you do.