I think you faff and things take much longer than they should. Also you could make your life easier by making small adjustments to the routine. Lots have been suggested already.
So tonight I got in at 4pm with DC, emptied bags and had a snack. They tidied their rooms whilst I hoovered, wiped the kitchen floor and swept out the fire. That took about 1.5 hours for me with a small break in between
How long was the small break? The hoovering doesn't need to take that long. Do the edging and the faffy bits under sofa etc. on days when you have more free time. Do a quick run around with the hoover in the main rooms every other day or so. I know you said it was because of taking decorations down, in which case that is an exception so you can't really extrapolate that to being a reason why you don't have an evening every day. Do the minimum hoovering in the evenings.
So finished around 6pm. DH got home at 6:30pm and cooked dinner, he had to pick up food on way home as was missing vital ingredient, I think it was ready about 7:15pm
What was DH doing between 6.30pm and 7.15pm? He could have been doing some of the other tasks such as doing the laundry or getting the packed lunch ready.
Also you had half an hour between the hoovering and starting to cook dinner so that meant you had half an hour of "evening time" then. Add that to the "small break" while hoovering and you've already had 45 minutes free time.
Eating dinner takes the kids ages so they finished eating at 8ish. Younger one needs help/supervision to get ready for bed so DH did that whilst I made lunches with the 12 year old. Finished all that about half 8
Having a family dinner counts as evening time. No one is working or doing chores and everyone's sitting around chatting.
Then unload dishwasher (we don't seem to have time in morning) dry up and wash up, sort and put load of washing on. Took at least 1.5 hours for one person. Have to wash up as it won't all fit in and non stick pans aren't dishwasher safe, neither is some of our crockery. I did have some evening whilst DH was washing up but we never get time together.
This is faffy and takes far too long! Speed up!