Sentence:  And no use for anyone to tell Charles that this was because the Family was in mourning for Mr Granville Darracott […]: Charles might only have been second footman at Darracott Place for a couple of months when that disaster occurred, but no one could gammon him into thinking that my lord <WSD>cared</WSD> a spangle for his heir. 
Meaning of the word marked with <WSD> tags:  (verb-be-concerned)  To be concerned about, have an interest in.