It's breaking my heart my parents won't give him a chance?

I already asked this question but there were other details that I forgot to include.

My boyfriend is 29, when he was 15 he was addicted to ice (the drug) and he's been clean since he was 20 so he looks older than he is, I and my friends both think he looks in his mid 30s but my parents think he's 40. He has 2 kids that he doesn't live with but sees on their school holidays as they go to school in another state.

He was going to meet my parents for the first time on Saturday, but before they even talked to him they looked him up on Facebook and found that he's had 2 kids. They're completely against it now, they're telling me they're gonna kick me out of the house if this continues .. However when I left they made my brother call me back.

I've told them I'm going to break up with today (I'm not, I thought if I tell them in a few months they might see that he means a lot to me and they might give him a chance)

They're treating me like such a child right now and they always have but this has just ridiculous, I don't feel that they should dictate who to date

So what do I do?? How can I go out with him without them knowing? I am not allowed to drive (medical thing) so that makes things A LOT harder