How can I change a <StackLayout> <Grid> screen to use <RelativeLayout>?

I have this code that's currently a combination of and

I would like to move to a relative layout and have not seen so many examples of that. Would appreciate any suggestions on how this could be accomplished.

Some points about the XAML.

• Either emptyGrid or phraseGrid appear on the screen
• Either buttonGrid or tapGrid appear on the screen
• The vertical center of the buttons and the tap label should be the same position. So that when the buttons are not showing a tap label appears at the same vertical buttons as the buttons.
• The Frame appears inside a tabbed page

I realize this is a bit more than a simple question but I'm sure it would be of interest to others. As the answer might be quite involved I'll open up a 250 point bounty for this in a couple of days.

    <Grid x:Name="emptyGrid" Grid.Row="1" Grid.Column="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <StackLayout Padding="10,0,10,0" HorizontalOptions="Center" VerticalOptions="Center">
            <Label x:Name="emptyLabel" FontSize="18" XAlign="Center" TextColor="Gray" />
        </StackLayout>
        <Button x:Name="resetButton" Text="Reset points?" TextColor="White" FontAttributes="Bold" FontSize="20" HeightRequest="60" BackgroundColor="#E19A3F" HorizontalOptions="FillAndExpand" VerticalOptions="StartAndExpand">
            <Button.FontSize>
                <OnPlatform x:TypeArguments="x:Double" iOS="25" Android="20" />
            </Button.FontSize>
        </Button>
    </Grid>

    <Grid x:Name="phraseGrid" Padding="20, 20, 20, 20" BackgroundColor="Transparent" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
        <Grid.RowDefinitions>
            <RowDefinition Height="6*" />
            <RowDefinition Height="6*" />
            <RowDefinition Height="80*" />
            <RowDefinition Height="13*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <Grid x:Name="prGrid" Grid.Row="0" Grid.Column="0" 
            Padding="5,0,0,0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand"
            BackgroundColor>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="50*" />
            </Grid.ColumnDefinitions>
            <Label x:Name="msg1" Style="{StaticResource smallLabel}" Text="msg1" Grid.Row="0" Grid.Column="0" />
            <Label x:Name="msg2" Style="{StaticResource smallLabel}" Text="msg2" Grid.Row="0" Grid.Column="1" />
            <Label x:Name="msg3" Style="{StaticResource smallLabel}" Text="msg3" Grid.Row="0" Grid.Column="2" />
        </Grid>

        <Grid x:Name="siGrid" Grid.Row="1" Grid.Column="0" 
            Padding="5,0,0,0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="25*" />
                <ColumnDefinition Width="50*" />
            </Grid.ColumnDefinitions>
            <Label x:Name="faveLabel" Style="{StaticResource smallLabel}" FontFamily="FontAwesome" Grid.Row="0" Grid.Column="0" />
            <Label x:Name="wordTypeLabel" Style="{StaticResource smallLeftLabel}" Grid.Row="0" Grid.Column="1" />
        </Grid>

        <Grid x:Name="wordGrid" Grid.Row="2" Grid.Column="0" 
            HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
            <Grid.RowDefinitions>
                <RowDefinition Height="45*" />
                <RowDefinition Height="55*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <Grid Grid.Row="0" Grid.Column="0" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
                <Label x:Name="textLabel" FontSize="45" XAlign="Center" VerticalOptions="Center" LineBreakMode="WordWrap" />
            </Grid>
            <Grid x:Name="detailGrid" Grid.Row="1" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" Padding="10,0,10,0">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <Label x:Name="detail1" Grid.Row="0" Style="{StaticResource bigLabel}" />
                <Label x:Name="detail2" Grid.Row="1" Style="{StaticResource bigLabel}" />
                <Label x:Name="detail3" Grid.Row="2" Style="{StaticResource bigLabel}" />
            </Grid>
        </Grid>

        <Grid x:Name="buttonGrid" Grid.Row="3" Grid.Column="0" 
            HorizontalOptions="FillAndExpand" VerticalOptions="Center" Padding="20, 0">
            <Button x:Name="aButton" Style="{StaticResource pointButton}" Grid.Column="0" Text="0">
            </Button>
            <Button x:Name="bButton" Style="{StaticResource pointButton}" Grid.Column="1" Text="1">
            </Button>
            <Button x:Name="cButton" Style="{StaticResource pointButton}" Grid.Column="2" Text="2">
            </Button>
            <Button x:Name="dButton" Style="{StaticResource pointButton}" Grid.Column="3" Text="5">
            </Button>
        </Grid>

        <Grid x:Name="tapGrid" Grid.Row="3" Grid.Column="0" HorizontalOptions="FillAndExpand" VerticalOptions="Center">
            <Label x:Name="tapScreenLabel" Style="{StaticResource smallLabel}" />
        </Grid>

    </Grid>
</StackLayout>