Am I a Bad Mother?

Because I allowed my children to go bowling tonight, a school night, with my very dear father-in-law and they're only JUST getting home now - 8:45 pm - and we have yet to do baths and the whole bedtime routine? The truth is, you see, I didn't think they needed quality time with Grandpa or a bowling outing as much as I wanted an evening off. And my house to stay clean. Because children? They're a freaking mess. Almost as bad as husbands.