While Britney Spears
tours the country with Nicki Minaj ... mama Lynne Spears
is taking care of the kids. And Lynne was recently spotted showing off her figure in a one-piece bathing suit while taking her grand-babies out for a swim in their hotel pool in Dallas, Texas.
Lynne Spears may be 56 years old ... but judging by this photo, it looks like her body is better than her 29-year-old daughter!
Lookin' good mama Spears ...