android - Want to display 2 buttons vertically on top of each other, starting from the centre of the screen - only one button displays -

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this first time using xml , working android noob. want have 2 buttons; sign in , create account, sign in @ centre of screen , create account directly beneath it.

what have create account button , it's @ top of screen not centre. reason, sign in doesn't appear anywhere. can take @ xml doc , see if can spot why happening? 

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:padding="25dp" android:layout_height="match_parent">  <button     android:id="@+id/bsignin"     android:text="signin"     android:layout_centerhorizontal="true"     android:layout_width="match_parent"     android:layout_height="wrap_content" />  <button     android:id="@+id/bcreateaccount"     android:text="create account"     android:layout_centerhorizontal="true"     android:layout_width="match_parent"     android:layout_height="wrap_content" />  </relativelayout>

oh , main activity (if has relevance). highly appreciate help!

use this: 

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:padding="25dp"     android:layout_height="match_parent">     <relativelayout     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_centerinparent="true">     <button         android:id="@+id/bsignin"         android:text="signin"         android:layout_centerhorizontal="true"         android:layout_width="match_parent"         android:layout_height="wrap_content" />      <button         android:id="@+id/bcreateaccount"         android:text="create account"         android:layout_centerhorizontal="true"         android:layout_below="@+id/bsignin"         android:layout_width="match_parent"         android:layout_height="wrap_content"      />     </relativelayout>     </relativelayout>

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