PS At the end of the day say to them" Come on time to clean up, lets see who gets their stuff picked up first, make a game of it.
Cleaning up doesnt matter too much does it, how about you focus on their positive side and do things with them, if they are busy they wont have time to cry and get bored, take them out, go to the park focus on having fun,there must be things to do over a weekend, is their Dad involved with sports and Games , Dont feed into any crying ,let it go, if the 6 year old wants to cry because she cant get her shirt on its not a problem ..show her how she can get it on.make her laugh about it, best thing for you all is to get a lot of fun and humor going.