It happens, unfortunately. My best advice is to vape around him as usual. You can offer to let him to try, but don't be pushy - it won't help. Let him come to you.
I agree with this. Trying right now to see if my baby sis will get on this journey with me. I decided however not to be the preacher type especially beeing such a noob. I just vape it front of her, my family and my friends. If they ask, I'll share....cool thing is baby sis asked the other day so I started sharing =). Everytime she asks me to try it, I just hand her my PV and let her hang on to it till she gives it back. First couple times it was quick as she kept coughing and choking but after a few rounds of this she started getting into it. I let her use one of my spare setups yesterday, so we'll see where we go from here. Wish her luck! And good luck to you too.
Viva La vape!