This will totally not be helpful, but...

...as a person with graduate training in both molecular genetics
and the learning disabilities field, I would be all for collecting the samples.

...as a parent, I admit to feeling rather squeamish for privacy reasons.

What kind of assurances of aggregation/disaggregation do they have? How much PID is connected to the DNA? How open-ended is the consent for research beyond this specific project?

...pronounced like the long vowel and first letter of the alphabet...