First of all, your crypto is your business and nobody should know about it. Not even close relatives, some people aren't bad, they're just ignorant, not knowing something is better than knowing it because you can't tell what you don't know.
Second, get yourself a cheap phone, one with a clean OS, I'd suggest the European market since those in other continents tend to have a lot of bloatware which is bad.
Forget about all these fancy looking USB sticks, hackers will target those but they won't target you. There have been multiple leaks involving Nano Ledger and Trezor, personal information etc,︀ and those leaks have been followed by robberies and such.