how do I tell my family

My ex fiance and I have recently started seeing each other again. We have been working through everything that happened in the past and getting to know each other again. We split when I was pregnant with our now 6 year old, due to many reasons. Thing is I don't know how to talk to my family about it. They have seen and heard about every argument etc over the past 6 years, but only ever my side of things. So they are not fans of him, but I dont want to keep it from them. Our kids are staying in the dark until things get serious (if things get serious). Just looking for some advice here.