How To Tap Mobile Calls Is It Possible For Other People To 'tap' Your Mobile Or Computer?

Is it possible for other people to 'tap' your mobile or computer? - how to tap mobile calls

Years ago, my father calls my mother, an affair, and not as we know it recorded the telephone suspicion from our house for 2 years (although having an affair!). But no matter, because then I got very paranoid that my family stayed in my computer and phone and can see exactly what comes in by other phones and computers is it possible?