In fact while the fathers of Matthias Corvinus Hunyadi and Vlad Tepes were enemies, the sons had an uneasy truce. The reason for this lies with the Ottoman Empire. At this point, Hunyadi needed Tepes to protect his territory, which included Transylvania.
|Bran Castle... which lies in Transylvania and close to Wallachia.
Once his brother was killed, Vlad would be killed in 1477. By this time, the Hunyadi and Dracula connection was secured. Tepes's sons from his second wife would marry into Hungarian nobility and possibly would remain in Transylvania.. This would last until 1919.