When he became a coach, he was not yet under investigation, so they would have allowed him to coach. The current allegations are very vague. Is it fair to assume he's done something to harm his kids (sex abuse, physical abuse) when LE keeps saying not to read too much into this, and have not arrested him on charges of same?
He may still be perfectly suitable as a coach, and though I doubt he's really interested in going back to that right now, he may want to at some point and this will need to be addressed. Also, if his parents have other grandchildren who occasionally visit in their home, is there any problem with Sergio staying there while under investigation by CPS?