[quote=LordZell]
Well that could be done but I meant like for the backstory how our houses/families came into contact with your house and became the Lords
[/quote]
Yes, I will add some in my family history. Most likely those that will be given control of counties will be mentioned as supporters of the Duke at the time of breakdown of Austria. I plan to have the breakdown some 50 years prior to the start of the RP so that there's a bit of history between. Perhaps I will fit in a war of Austrian aggression in attempt to recapture it's lost territories, etc. so some prominent knights or nobles that fought against the Austrians were awarded land etc. I won't name families in that so whoever wants to take that route in writing their family history can do so. 

As for royal marriages with my family, it's possible although it's most likely going to be possible only for the most prestigious and strongest royal families. Now, since I don't plan to kill my royal family this means those that marry with me will probably not going to inherit anything. On the plus side they are more likely to be awarded new land and will be somewhat preferred in conflicts between noble families. If both families have intermarried with me then I will be neutral in the conflict.