Succession Crisis on the Vale

It seems a problem has occurred with me burning the mountain clans and having a dragon many lords are supporting me for the succession instead of my older brothers son Jon who is only 5 nameday old it seems my brother died as well from what I gathered father and him were ambushed by the mountain clan.

a civil war in the vale was about to erupt when the lords saw Arrax the Cannibal with that they have decided to support me as lord of the Vale.

It seems I need to strengthen my position but my mother has fixed the problem by marriage my sister Aemma is bethrothed to Viserys. and my sister Shaerra is set to marry Loewyn Cobray

this will enable House Arryn to have Royal Favor and support in the Vale. many lords wants me to marry their daughter but mother insisted that dragonlord must marry a dragonlord so she insisted me to marry my aunt Gael who is now 16 namesday old and rider of Sheepstealer In which I agreed immediately in my mind the more dragons the Vale has the better but first I must cleanse the Vale of this mountain clan rats