You could just start wetting your pants when you're around your parents or whenever you're with your parents.
Instead of holding in your urine just wet your pants instead. Keep wetting your pants on purpose and your parents might decide that you need diapers again.
You could also fake bed wetting to get your parents to maybe make you wear diapers again to bed.
Instead of getting up to pee just pee in your bed but make sure you fill up on a lot of water before going to bed so your bladder will be full.
You could also fake bed wetting by pouring water on your bed and getting it soaked.
You could also fake Incontinence by making a wet spot on your pants with water but actually peeing in your pants would work better since the urine would start to smell if you don't change your pants.
Just start automatically peeing your pants when your parents are around and say you didn't realize you had to go pee.