Credit goes completely to Lue for helping me figure this out.
Table stolen from Courtesy Titles.

[doHTML]
<table><table cellspacing=5 cellpadding=3>
<td><b>Peerage Type</b></td>
<td><b>Wife</b></td>
<td><b>Eldest Son</b></td>
<td><b>Younger Son</b></td>
<td><b>Daughter</b></td> <tr>

<td>Duke</td>
<td>Duchess</td>
<td>Marquess</td>
<td>Lord</td>
<td>Lady</td><tr>

<td>Marquess</td> <td>Lady Marquess</td> <td>Earl</td> <td>Lord</td> <td>Lady</td> <tr>

<td>Earl</td>
<td>Lady Earl</td>
<td>Viscount</td>
<td>The Honourable</td>
<td>Lady</td><tr>

<td>Viscount</td>
<td>Lady Viscount</td>
<td>The Honourable</td>
<td>The Honourable</td>
<td>The Honourable</td><tr>

<td>Baron</td>
<td>Lady Baron</td>
<td>The Honourable</td>
<td>The Honourable</td>
<td>The Honourable</td><tr>
</table>
[/doHTML]

Points of Interest

• The High Seat is inherited, unless their are no heirs. If the heir is not of age, a regent will be appointed.
• If there are no heirs, a close relative of the High Seat will usually be found. The new High Seat must formerly have been a Duke, Duchess, Marquess, or Lady Marquess.
• Rarely are women allowed to hold a title of their own, except if they have been widowed or within the High Seat's immediate family.

More may come later. Please address all questions to the Support forum.