That doesn't sound natural at all. You'd say something like 'It's so nice to see you' in this situation. If, for example, you have gone to meet your cousin at the station or airport and the rest of your family are waiting at home, you might say 'We're all really looking forward to your visit'.

I mean that's ok, but just saying welcome nicely with a smile would be more natural and casual.

welcome to my house you are welcome here I think these are the most used phrases