How to flirt and hold hands with a guy when you know (some people in*) your family will "judge" and tease you? *My sister (mainly) will tease me in a harsh way when I'm talking (in her opinion, it's flirting) to (any) guy and it's really annoying!

If youre worried about what others think or say here, then you are not ready for a relationship  because if you truly liked this guy, you wouldn't care about this so think about this as you wont and cant please everyone so go for what makes you happy.  Good luck