It is refreshing to hear a question from a home seller who truly understands what is needed and expresses their concern. When it comes to a homes appearance there are four area that MUST be evaluated and,if necessary, action taken to remedy or minimize the effect.
1. Curb appeal
3. Declutter. Now lets look at this with a bit more granularity. I home that is occupied will have evidence that people are living there. Toys are one of those elements. However, the primary issue addressed with decluttering is that of TOO MUCH FURNITURE! Rent a storage unit and move things there until a good amount of floor is exposed. The more floor a buyer sees the more space perceived. If you haven't used it in the past month,,,put IT in storage! Start packing! After all, you do intend to move...RIGHT?
A second element of decluttering is the convenience items. All that stuff on the refrigerator, nick-nacks, and most importantly....the array of devices on the kitchen counters. Some homes with very small children have to face issues such as the high chair and play pens ect. As can be easily recognized, this becomes a growing chore that has no end in sight. In this situation, a seller may find it beneficial to only allow the home to be shown on a scheduled basis such as on Thursday and Saturday ONLY. The benefits will outweigh the consequences. With a bit of thought and observation you may recognize other beneficial dimensions of such an agreement. But there's more!
Have you agent have a little chat with the kids. (Some kids don't hear as well when their parents are speaking. Let your agent do this ground work.) It should go something like this. "I need your help. If you would be so kind and helpful, could you please help your mother put your toys away when she asks you to? When I come to see your home and I do not see any toys laying around, and everything is picked up, I'll leave for you a grade card. If you get five starts, I bet your mom will take you to "appropriate reward here" to celebrate how very helpful you are." I've actually had the prospective buyers write comments on the 'grade card' for the kids to see. The makes a world of difference.
Most agents, in that holder that has all their business cards, in the back is a stack of gift cards for purposes just like this. It turns a frenetic situation, like you describe, into a truly fun time.
I wish you the very best of success in selling your home.