I'd ask yourself what you're going to gain from telling them vs the risks. I'm sure they're understanding nice people and they'll put alittle put off, but otherwise okay with it if you told them, after all they've seen you in diapers before. But you do risk a negative reaction.
All my experiences with telling people have been luke warm to positive. I've had two girlfriends that have totally accepted this side of me without issue.
And more relating to your situation, when I lived at home I came to terms with the fact I'll always be a diaper fetishist and I really just grew out of being embarrassed about it, so I just stopped trying hard To hide anything. My diapers were kept in plain sight in my closet and i wore under clothes most of the time while I was at home.
Eventually my mother found out When I was 19 or so and it wasn't a big deal, she thought it was weird but honestly she didn't really care.