Formal:
* Sejam bem-vindos à nossa casa. (This is the most formal option, suitable for welcoming guests to your house.)
* Bem-vindos à nossa casa. (This is slightly less formal than the first option, but still appropriate for guests.)
Informal:
* Bem-vindos em casa! (This is the most casual option, suitable for welcoming friends and family.)
* Sejam bem-vindos na nossa casa! (This is also a casual option, but it's a bit more formal than "Bem-vindos em casa!")
You can also say:
* Sintam-se à vontade. (This means "Make yourselves at home" and is a good way to make your guests feel welcome.)
Ultimately, the best way to say "Welcome to our home" in Portuguese depends on the specific situation and your relationship with the person you are welcoming.