I'm sure everybody has been in this position
When I told the better half I was looking to blow £40k+ on chasing my dream as an Airline Pilot there was a smile and a condescending comment. But after 2 or 3 years of saving and researching I think she understands that I WILL be chasing my dream at all costs.
I've told her if I get to do some bush flying in Africa/Alaska I'll be off, if I get a job as a FI/CFI I'll be off and one day when I'm sitting in the RHS of a TP/Jet I know it would have been worth the commitment and sacrifices.
It's a lot easier now that she understands how strong I feel about it, parents is a different matter all together. After seeing my OAT PPL CBT pack at the side of my PC in my apartment it soon raised a few eyebrows but I quickly said "It's to help me pass my PPL that I've been saving up for ... maybe I'll fly you both to Jersey for lunch" with a smile on my face.
Only after gaining my PPL and passing all 14 ATPL exams will I start letting people know my plans
Good luck buddy!