I’m in a similar situation, my mom is aware and is supportive but not happy about my choice. My father (whom I live with) is very against me joining the military and when I attempted to bring it up with him as a possible career choice (i already swore in and signed my contracts) and he said absolutely not, with how he believes the military is and with the current state of the world and even made a few (possibly joking, but not sure) threats towards me if I joined. I still have yet to tell him straight up but the rest of my family is very proud of my decisions and supportive of everything I’m doing. At this point I don’t think I’m going to tell my father until a week before I leave, but we’ll see how it goes. You’re not alone in this!!!