My place or yours -
'Dy le di neu fy lle i?'
The Welsh equivalent of "up yours" is "rhowch fyny i chi," which translates to "put it up to you."
It is not incorrect to say "yours and your family's", but it is custom (considered good manners) to place yourself last in a group spoken about, as "your family's and yours".
"You are Welsh" = Rwyt ti'n Gymreig
'Our Friends' in Welsh is 'Ffrindiau Ni' :)
To say "your house" in Welsh, you would say "eich tŷ".
Cymraeg
No in Welsh is dim.
"y diwedd" is how you say it in Welsh language.
In Welsh, you would say "Rwy'n cytuno" to say "I agree."
Draig Gymreig
You can say "it's nice" in Welsh as "mae'n braf."
At a guess "Chez-moi ou chez-vous?"