Woman who was abandoned at birth sets out to meet her biological siblings

Andrea Klug-Napier, who was abandoned at birth, recently discovered she has a sister and two brothers who were also deserted by their biological mother.
3:10 | 07/13/18

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Transcript for Woman who was abandoned at birth sets out to meet her biological siblings
W tal about this covering a family secret. Two D womenooking for their birthot and eh other andmuchmore. Their late mother concealed her pregnancies and their births and dah Roberts reporting for "20 following them a journey to find why that same mother kept and ised her T other, their ogical brothers but not them. Reporter: Andrea scovered a sister,eather and together they're going to meet two brothers they never E knew had. Supernervous. Kind of have a stomachache. Reporter:ndeone else, biologicaldad.oh, boy. Hi. Hi. Hs it going. Good. Hi. I'm Andrea. Hi. Nice T meet you. Finally face-toe with hewho ans the door and then theirher Dwight. You were meeting your biologicalhe two brothers that you Nev had any idea listed. An't even describe the feel it was crazy.dwediately started ING to us and telling us everng Thate knew about ourmother. You guys look like mom time. Didn't ev K she was eg with or Heather. She hidything,ll those pregnancies, had no idea about. Osle will look at this and say, how could this be? How could your wife give birth and youe no idea? Still question it M toy wondering how did I miss ? He says when their mother Cindy pregnant with their sons Aaron and nn barely Her stomach wasn'tig a all. Seemed like shened a little weight to the face. You a living together in thme house, you're sleeping together in the Sam bed. You mt have seen her disrobe, you have -- Yeah, we slept I T same bed. You never recalled looking pregnant. No, not ev how is it possible THA his wife could give birth and he hing about it. I'vekeamilies and people question how could N one know. How could you hide a ne-month egnant belly but women do it lhe ti The answer may lie in a strange nion O Cindy's death certificate. Unatte birth associated with psycho denial. Toeny a pregnancy is a recognized psychological conditio kind of as aefense mechanism. In denial she's egnant. The dieraid is surprisingly mmon, 1 in 400 woayuffer fm some form. It seems difficult to believe, absolute but in many of these cases, yeah, theamily know at all about the egnanc the woman may have some idea she's pregnant intellectuabut it from her mind til she can no longer do so because she's sudden DI living bi Reporter: For "Good morning America," deb Roberts, ABC news, York. And tonight on "20/20," you can fd out how many more types her mother gave birth without anyone family knowing. That'st 10:00 P.M. Eastern here on C.

This transcript has been automatically generated and may not be 100% accurate.

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