Sorry to be the downer here, but my advice would be to invite your Catholic friends who would be supportive of you, who love Christs’ Church and would really appreciate being at the Easter Vigil.
I know it sounds very warm and fuzzy to invite your family and everything, but honestly, the Easter Vigil is long and I don’t think this is the best way to go about introducing your family our beautiful Faith. They will be bored, won’t understand what’s going on and, yes, they will most likely even mock what’s going on. Imagine going to a function where you don’t understand the language, for 3 hours – that’s how it will be for them.
Don’t get me wrong here, I absolutely love the Easter Vigil and I do understand because I have been the only Catholic in my family for 15 years now and I have learned alot of lessons the hard way. When my last 2 children received their sacraments I didn’t even tell my family. We just had a nice little party ourselves and it was wonderful! There are so many other times when the Holy Spirit opens up opportunities to share our Catholic faith with the family.
Ultimately, you need to pray to the Holy Spirit for guidance and wisdom. Be assured of my prayers also.