Just tell them when they ask ya, That's the simplest approach

how do you know they will ask me tho

They're bound to, Every parent (That cares about their kid) does that,
For example, They might ask "Why haven't you got a girl/boyfriend yet?" or "You dating someone?" or "Meet anyone yet?"

I guess so... thanks fro the help

I wish you the best of luck.

Hi there, fellow bisexual! I was in a same place as you for quite a while. I think to comfort myself, I looked at a coming-out scene from one of my favorite books. I also looked at the couch I was sitting on rather than making eye contact (tbf, I have ASD, so the eye-contact was likely more important in my situation than in yours).

do it through a gay joke

like if someone says "throw this straight at me" go "but im not straight"

oh wow thx

that is a really good idea