At this stage, I found that the slowcooker was a great friend! Also my oven which has a timer that I can pre-programme when it comes on. Both these allowed me to put food on at a time that suited me, ready for mealtimes.
Your husband has been working all day, but so have you. When you're both in the house, then you both pitch in with the children!
My 4 year old has had to learn to compromise. Yes he has a tantrum, but those are ignored. When mummy says no, mummy means it! He's old enough now to understand that baby's needs come first. He can have fun in other ways.
Maybe try and organise (buy!) some exciting indoor activities, playdoh, glitter, stickers, stamp sets, glue, cutting. My 4 year old loves printing stuff out from the computer and cutting it out. Get him out of the habit of the daily playing out, and then try and get him to understand that things happen on your say-so, not his.
I know how difficult it is to divide attention though. I still have that with at ages 4 and 2 unfortunately although increasingly they play together.