Parents choose care and enrichment programs the way they choose everything else for their family: quickly, on their phone, somewhere between school pickup and dinner. Email gets skimmed and buried. Phone calls get missed and never called back. Texts get read, most within three minutes of landing, whether that's a lunch break or 9pm after the kids are asleep.
SMS isn't a nice-to-have channel bolted onto your marketing. Done well, it's what makes a parent feel like someone is actually paying attention to their family from the very first inquiry.