What a lovely photo. I think it dates sometime in the 1870's. Is it in England? I feel whilst not a mourning picture it was perhaps a 'semi' mourning if that makes sense. I think the little girls dress is strange - as it is showing her chest & shoulders. As to the Language of flowers - well I think they are roses at least 2 of them. While I am no expert on the meanings I think it means unconditional love - also courage & respect. So perhaps something to do with a bereavement? what a mystery! I an a bit dubious about family stories - I think what started as fairly accurate could easily get changed over time a bit like Chinese Whispers. Those are my thoughts & I may easy be wrong!