One is "at the house" when informally speaking about being in the house, or around it, and this is typically used when to familiars. Formally, at the house often means just outside. In the house is...
To say "My house is your house" In Hebrew, you would say: (English transliteration)
"Ha Bayit Sheli, Ze Habyit Shelach/Shelcha"
If your saying this to a girl, you say "Shelach"
if your...