Can I get in trouble for not reporting child abuse?

I run a daycare center in Houston. I have a child who keeps coming in with bruises and marks on her skin. I’ve asked the mother about it several times and she gives a reason for each incident, but it doesn’t add up to me. I’ve thought about making a report to the Department of Family and Protective Services, but I can’t prove anything and I’m worried the parents will sue me for making a false report if I’m wrong. The father works for the government and has a security clearance. When I told my husband about this he told me if I don’t report it and it turns out to be actual abuse, I could face criminal charges. Is that true and if so, what do I need to be able to show to DFPS to prove I was genuinely concerned for the child’s safety?