Sentimental Tommy by James Matthew Barrie

Elspeth at last did something to win Tommy's respect; she fell ill of an ailment called in Thrums the croop. When Tommy first heard his mother call it croop, he thought she was merely humoring Elspeth, and that it was nothing more distinguished than London whooping-cough, but on learning that it was genuine croop, he began to survey the ambitious little creature with a new interest.

This was well for Elspeth, as she had now to spend most of the day at home with him, their mother, whose health was failing through frequent attacks of bronchitis, being no longer able to carry her through the streets. Of course Elspeth took to repaying his attentions by loving him, and he soon suspected it, and then gloomily admitted it to himself, but never to Shovel. Being but an Englishman, Shovel saw no reason why relatives should conceal their affection for each other, but he played on this Scottish weakness of Tommy's with cruel enjoyment.