Also, if you can, try to establish a relationship with the parent. Parenting is hard. Sometimes, a little support can go a long way. Some parents haven't acquired proper parenting skills as they were abuse victims themselves and good parenting skills were never modeled for them. Having someone lend them a hand and model good parenting skills can really make a difference. Just make sure you don't go in with a know-it-all attitude. Simple statements like, "It must be really hard working and being a single parent. Is there anything I can do to help?" "We really like Sam and love having him come over. Is that okay with you?" Or call with, "I just made lasagna and we can't possibly eat it all. Would it be okay if we run some over to you?" Simple statements that offer support can be very important. Also, focus on the positives you see, "Sarah is an excellent reader. You must have worked a lot to help her." "Tom always uses his manners when playing with my son. You have done an excellent job of teaching him!"
However,iIf you continue to see evidence of abuse, even after authorities are called, KEEP CALLING BACK! The child is unable to protect him/herself and needs you to keep trying!