In Spanish there is this saying "Candil de la calle, oscuridad de tu casa". Which is basically said to people who do good outside, e.g. at work or school, but does nothing good at home for his or her family. A literal translation to English would be something like "A light in the street, but darkness at home. Is there an equivalent saying in English for this?
Learn English – a saying for someone who does good in the street, but is bad at home
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Best Answer
The phrase
might be what you are looking for. It seems to be more commonly used in Ireland than elsewhere but Google returns about 19,500 matches and Google books returns about 1,690 results.
It means exactly what the Spanish phrase quoted by the OP describes (though perhaps not "exactly" because it is typically used in reference to children, whereas the OP's question does not differentiate between children and adults).
It's common also to hear only half of the phrase used
because it's assumed the reader or listener is so familiar with the phrase that the second half can be left unsaid.
Here is a recent example from a parental advice column in the Irish Times:
Ask the Expert: Our girl is a street angel and a house devil
and here is one from a popular Irish parenting website, rollercoaster.ie:
Street Angel/House Devil!! 10 yr old
Searching for "street angel house devil" in Google Ngrams yields no results, but a search for the two phrases independently shows they follow a roughly similar pattern.