sapperkenno
In theory you could wait until your daddy has citizenship (3 years if married to US national) and then file the application. The thing is, not having it checked for ages, but as a child of US sponsor, you'd still be the slower stream of family migration. Not the slowest though. So filing now and later may work out pretty much similar timewise.
Duchess_Driver and BigG,
Wow. Something I know more about (not aviation related, ahem). FYI, almost right. As of past years, being born in Northern Ireland DOES NOT prevent you from applying through DV visa. Aka Green Card lottery. Chances slim, but there's a quota for each 'country' - where NI is considered separate from the rest of UK, and if there aren't many applicants, chances go up. Then, there's the issue of 'case number' - if high, forget about making it all in time, sending and shuffling paper. Stupid, but so it is..
BigG mentioned correctly. It's 'derivative' status, ie country of birth. Then, one could also claim this as per spouse's country of birth. Handy, innit? Marry someone from country that gets high number of DV places and little applicants and there you go.