It just occurred to me that the majority of maternal figures in Lab Rats aren't that nice to be around.
Rose Dooley: Tasha has to restrain herself from saying something that would probably be bleeped out if she didn't change the way the line ended. And the other lines in that scene indicate Rose likes to make her family miserable. Oddly though, she doesn't act this way towards her grandchildren.
Mrs Perry: The only person in the show that truly terrifies Principal Perry. That about says it all. Although given how sadistic Terry Perry is, you don't feel any pity for her.
Mrs Davenport: Not seen onscreen, but Douglas states that one of the good things of being assumed to be dead is that he doesn't have have to speak to their mother. And then he mentions she never stops calling him despite the aforementioned dead status. He also ask that the next time Donald speaks to their mother, that he not tell her he is still alive.
It looks like Tasha is the only nice mother in the show, although she can be painfully embarrassing at times.