I like the idea of having such a plugin.
However if anyone decides to creat such a plugin, please do not use what Wikipedia seems to use as syntax. That's horrible:
{{ahnentafel-compact5
|style=font-size: 90%; line-height: 110%;
|border=1
|boxstyle=padding-top: 0; padding-bottom: 0;
|boxstyle_1=background-color: #fcc;
|boxstyle_2=background-color: #fb9;
|boxstyle_3=background-color: #ffc;
|boxstyle_4=background-color: #bfc;
|boxstyle_5=background-color: #9fe;
|1= '''William Fiennes'''
|2= [[Richard Fiennes, 7th Baron Saye and Sele|Sir Richard Fiennes]]
|3= Constance Kingsmill
|4= [[Richard Fiennes, 6th Baron Saye and Sele|Richard Fiennes of Broughton]]
|5= Ursula Fermor
|6= Sir William Kingsmill of Sidmanton
|7= Bridget Raleigh
|8= [[Edward Fiennes, 5th Baron Saye and Sele|Edward Fiennes]]
|9= Margaret Danvers
|10= Richard Fermour
|11= Anne Browne
|12= Sir John Kingsmill of Sidmanton
|13= Constance or Elizabeth Goring
|14= George Raleigh
|15= Joan or Jane Coningsby
|16= [[Richard Fiennes, 4th Baron Saye and Sele|Richard Fiennes]]
|17= Elizabeth Crofts
|18= Sir John d'Anvers of Culworth, Dantsey/Dauntsey and Waterstock
|19= Lady Anne Stradling
|20= Thomas Fermour of Whitney
|21= Emmote Hervey or Harvey
|22= [[List of Lord Mayors of London#16th century|William Browne]]
|23= Margaret or Katherine Shaw
|24= Sir John Kingsmill
|25= Joane or Jane Gifford
|26= John Goring of Burton
|27= Constance Dyke
|28= Sir Edward Raleigh
|29= Ann or Anne Chamberlaine
|30= ''maybe'' Sir Humphrey Coningsby
|31= ''maybe'' Alice Ferreby of Lincolnshire
}}
There's no way to see how those persons are related, unless you can render HTML tables from that in your mind.