It's "you are welcome." It could also be written "you're welcome" which often sounds as though they are saying "your."
to answer your question its meet the browns not welcome to the browns.
It is a polite response.
welcome abourd or welcome onboard is both good because the both make sence
"You're" is short for "You Are" ... so "you're welcome" is quite correct "Your" is possessive term ... "it is your bike" ... not "your welcome" .
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