I found two songs titled "Mi Casa Es Su Casa." One was recorded by Perry Como in 1957:

MI CASA, SU CASA (My House Is Your House)
(songwriter unidentified, recorded by Perry Como)

[Verse 1]
Mi casa, su casa
My house is your house
Welcome to my hacienda
Mi casa, su casa
My home is your home
I'll give you love warm and tender

[Bridge]
My house is nothing more
Than windows and a door
And a roof that will keep out the rain
The day you say you're mine
My humble house will shine
Just like a castle in Spain

[Verse 2]
Mi casa, su casa
My house is your house
Let's plan the future together
Tell me, oh, tell me
That your heart is my heart
And I will love you forever

[Instrumental Break]


[Bridge]
The day you say you're mine
My humble house will shine
Just like a castle in Spain

[Verse 3]
Mi casa, su casa
My house is your house
Let's plan the future together
Tell me, oh, tell me
That your heart is my heart
And I will love you forever




Source: https://genius.com/Perry-como-mi-casa-su-casa-my-house-is-your-house-lyrics

https://www.youtube.com/watch?v=wsy2TsQ9vns