Formal:
* Maligayang pagdating sa aming pamilya. (This is the most formal and literal translation)
Informal:
* Welcome sa pamilya natin!
* Masaya kaming naging bahagi ka ng pamilya natin. (This means "We are happy that you are now part of our family.")
* Welcome ka sa aming tahanan. (This means "Welcome to our home.")
More casual:
* Welcome sa barkada! (This means "Welcome to the group!" and is used for friends)
You can also use a phrase like "Isa ka na sa amin!" which means "You are one of us now!"
The best way to choose the appropriate phrase depends on the relationship you have with the person you are welcoming.