((((suffocating))))
I guess you could let them know you wish they'd call or write. But it sounds to me like they simply don't see this situation the same way you do, as if they've found a long-lost sister/daughter. My feeling is that actions speak louder than words. Your father's wife says she regards you as a daughter. But she's called once in 8 years. I'm guessing she calls her daughters/sons quite a bit more often. Maybe they are guilty only of being busy and simply not thinking how this feels to you, but to me, their actions speak loudly. I personally would be looking elsewhere for love, joining groups that do things I love (reading clubs, swing dance lessons, a cycling club, a community choir, whatever) and finding friends who appreciate me and want me in their lives.