K.H.
Maybe you can slowly reduce the amount of time he watches tv and replace with other activities so those become the new routine. While I'm making dinner, my oldest (6) does homework. I give my 3 year old a white board or paper and have her practice writing/coloring etc. I talk to both girls while I cook.
For chores, I try to break things up. I fold a load of laundry in the living room while my daughter does a puzzle. Sometimes she is okay with playing next to me even though I don't have to give her 100% of my attention.
Does your son have any interests (puzzles, building with legos, coloring etc)? You could give him tasks to do while you clean (e.g. can you find 10 red legos and try to build a tower? See if you can do this puzzle before I fold this load of laundry.)
When all else fails, just hide the remote!
Good luck!