It sounds like you are working off of a list survey or google form survey. If this is the case, a simple thing to get parents is to ask your own. Funny enough parents normally know parents and having your parents share your survey with their friends or thru social media will help you build a network of parents.Another good way to get more parents is by joining parenting groups and asking for parents feedback. Make sure to include what the survey is about and what their opinions may impact. Most of the time when you state how giving an opinion in a survey may impact people are more willing to participate.If you are using a panel survey, itu2019s a simple click of a button to sort your demographics. Or you can always ask a pre qualification question.