* "E ho'okipa mai": This translates to "Welcome" in general, but you can use it to welcome someone home.
* "E komo mai": This means "Come in" or "Enter" and can be used to welcome someone home if they are physically entering the home.
* "Aloha 'oe, e hoi mai": This is more literal and translates to "Farewell to you, return" which could be used as a welcoming home phrase for someone who's been away.
The best phrase to use will depend on the context and your level of formality.