If you want to say that someone is welcome in your house, you can use êtrelebienvenu. But depending on gender and number, the phrase will change form!
Vous êtes toujours les bienvenus ici.
You are always welcome here.
Elle est la bienvenue chez nous.
She is welcome in our home.
Elles sont les bienvenues chez moi.
They are welcome in my home.
C'est un vieil ami
We've seen that the word bel is used instead of beau if the next word starts with a vowel or silent h. Similarly, you should use vieil instead of vieux!
Ce vieil homme a quatre‑vingt‑dix ans.
This old man is ninety years old.
Nous visitons la cathédrale
When you visit a person, you say rendre visite à, and when you visit a place, you say visiter.