What to do with a litter of stray kittens? (we think the mom is with them)?

We found 4 kittens and a bigger cat we are pretty sure is the mom in the street. Some neighbors told us they've been around for a few days. They look big for a baby but definietly not a adult cat. They look healthy and playfull but they were excited for some water and treats. When we asked some other people if they were their cats (not being racist, but they really cant talk english) they said "yeah" but more of like a question. So we aren't sure if they understood us. If they are their cats they are not getting shelter food or water. We don't think we should or want to call the ASPCA.