As most of you know, I have a set of twins in my care. They are of pretty average size, maybe a bit smaller than most their age. My problem is that lately the dad has been dressing the boys in pants that are too big for them....literally, the pants are falling off their wee bums. I am constantly pulling their pants up and lately, I have taken to changing them into a pair of pants that I know fit them in the waist (even if they are a tad smaller in length) once they get here and then changing them back into the pants they came in at pick up so that I always have pants that fit them here.
Mom has had conversations with me at pick up (dad gets them ready in the morning and does drop off) about what the boys are wearing (mostly about missing items like shoes or she laughs because what they are wearing doesn't exactly match).
Most of the boys clothes are second hand, so sometimes the waist is stretched on pants that should fit them, but most of the time it is because the dad puts them in clothes that are too big for them. He has sent them in clothes labeled size 3T or 24months, when they are just beginning to fit 18month pants.
It seems that they just put all the clothes in one drawer and dont seperate them due to size, so they are always wearing different sized clothing.
It is a safety hazard as they are always tripping on their pants as they are falling off their bums or they are walking on their pants and trip. Today I had one of the boys pull his pants right off with out any trouble. I changed his pants before nap time as I do not want him to do this during nap time and then pull off his diaper.

Should I mention something to the mom or should I just continue to do what I'm doing?