T.S.
Hi T.,
I totally can empathize with you! Although my husband does work full time, so it isn't the same situation, his days off are Wednesday and Thursday. Our son is in pre-school full time, so he has those two days completely to himself. I, on the other hand, am home Saturday and Sunday with my only free moments coming at "nap time." Reaching an agreement about which household chores each of us should be responsible for has been a challenge (to say the least).
Having worked through this (at least partially) I'd like to offer this advice:
Sit down together sometime when you are not already mad about it and make a list of the adult family responsibilities. Next to each one jot down the time each requires on a daily or weekly basis (ie 1 hour/week or 30 mins/day or 8 hrs/day). Be sure to include earning family income and caring for your son (maybe broken up into portions of the day)on your list. Then go through the list and assign each responsibility to one or the other of you.
Hopefully making the list will help you each understand and aprreciate what the other does and help even things out where they are unfair.
hope this helps,
T.