I had a couple of girls who were like that.... although the oldest was not well behaved with me during the day either... but they went nuts when mom showed up, hitting eachother, yelling at eachother and mom, refusing to put their stuff on. The oldest would even try to grab the younger sister around the neck to choke her if she got mad at her. Honestly, little B-R-A-T-Ts when mom showed up, only mom, on the rare occasion dad showed, they were fine, or when their aunt came to p/u they were fine.

I would remind them close to home time to behave for mum, she's been working all day, she misses them, and she just wants hugs and kisses instead of yelling and fighting (they were 4 and 6). Beyond that, as long as they arent behaving like that for me, I couldnt care less if they were little monsters at home. There was no way I was going to tell their mom how to parent her kids. This mom in particular would not have it even if I had the nerve to do it!