I agree with the other posters...your husband needs to get the situation under control and create a consistent routine with the boys. In the meantime, don't end up being the "wicked step-mother" (even if it is with love in your heart) because the last thing your hubby or the boys need is for them to start saying they don't want to visit you guys.
You didn't say how old they are, but keep in mind that a lot of boys between the ages of 5-7 are whiners...it is an age and stage thing.
Ok, that said, there are two other people you need to talk to. First, sit down with your husband and establish some of the more basic rules, ones you demand are followed to maintain order in the house...but still not what you would expect in a "perfect world." Remember that you are only their part-time mother and only have 1/3 of the influence over them, so make sure you and your daughter are setting good examples of good behavior. That brings me to the other person. You didn't say how old your daughter is but if she is 4 or older, it is important for you to have a talk with her, she may be confused or bitter about how "Dad" treats them. I don't mean complain to her about the boys, or riducule them in front of her, I mean explain to her that their behavior is not acceptable, but that under the circumstances, with them being tossed back and forth, that you guys need to be understanding about how hard things are for them. While Mother Dearest may seem like she is babying them, you never know how she really treats them behind closed doors. Sounds like they need some love, understanding and rules.